Biology and sexual orientation
The relationship between biology and sexual orientation is a subject of research. A simple and singular determinant for sexual orientation has not been conclusively demonstrated; various studies point to different, even conflicting positions, but scientists hypothesize that a combination of genetic, hormonal and social factors determine sexual orientation. Biological theories for explaining the causes of sexual orientation are more popular, and biological factors may involve a complex interplay of genetic factors and the early uterine environment. These factors, which may be related to the development of a heterosexual, homosexual, bisexual or asexual orientation, include genes, prenatal hormones, and brain structure.
- 1 Empirical studies
- 2 Biological theories of etiology of sexual orientation
- 3 Sexual orientation and evolution
- 4 Biological differences in gay men and lesbian women
- 5 Political aspects
- 6 See also
- 7 References
- 8 External links
A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. In a 1991 study, Bailey and Pillard found that 52% of monozygotic (MZ) brothers and 22% of the dizygotic (DZ) twins were concordant for homosexuality. 'MZ' indicates identical twins with the same sets of genes and 'DZ' indicates fraternal twins where genes are mixed to an extent similar to that of non-twin siblings. In 2000 Bailey, Dunne and Martin studied a larger sample of 4,901 Australian twins but reported less than half the level of concordance. They found 20% concordance in the male identical or MZ twins and 24% concordance for the female identical or MZ twins. Self reported zygosity, sexual attraction, fantasy and behaviours were assessed by questionnaire and zygosity was serologically checked when in doubt. A meta-study by Hershberger (2001) compares the results of eight different twin studies: among those, all but two showed MZ twins having much higher concordance of sexual orientation than DZ twins, suggesting a non-negligible genetic component.
Bearman and Brückner (2002) criticized early studies of concentrating on small, select samples and non-representative selection of their subjects. They studied 289 pairs of identical twins (monozygotic or from one fertilized egg) and 495 pairs of fraternal twins (dizygotic or from two fertilized eggs) and found concordance rates for same-sex attraction of only 7.7% for male identical twins and 5.3% for females, a pattern which they say "does not suggest genetic influence independent of social context."
A 2010 study of all adult twins in Sweden (more than 7,600 twins) found that same-sex behavior was explained by both heritable factors and individual-specific environmental sources (such as prenatal environment, experience with illness and trauma, as well as peer groups, and sexual experiences), while influences of shared-environment variables such as familial environment and societal attitudes had a weaker, but significant effect. Women showed a statistically non-significant trend to weaker influence of hereditary effects, while men showed no effect of shared environmental effects. The use of all adult twins in Sweden was designed to address the criticism of volunteer studies, in which a potential bias towards participation by gay twins may influence the results;
Biometric modeling revealed that, in men, genetic effects explained .34–.39 of the variance [of sexual orientation], the shared environment .00, and the individual-specific environment .61–.66 of the variance. Corresponding estimates among women were .18–.19 for genetic factors, .16–.17 for shared environmental, and .64–.66 for unique environmental factors. Although wide confidence intervals suggest cautious interpretation, the results are consistent with moderate, primarily genetic, familial effects, and moderate to large effects of the nonshared environment (social and biological) on same-sex sexual behavior.
Twin studies have received a number of criticisms including self-selection bias where homosexuals with gay siblings are more likely to volunteer for studies. Nonetheless, it is possible to conclude that, given the difference in sexuality in so many sets of identical twins, sexual orientation cannot be attributed solely to genetic factors.
Another issue is the recent finding that even monozygotic twins can be different and there is a mechanism which might account for monozygotic twins being discordant for homosexuality. Gringas and Chen (2001) describe a number of mechanisms which can lead to differences between monozygotic twins, the most relevant here being chorionicity and amniocity. Dichorionic twins potentially have different hormonal environments because they receive maternal blood from separate placenta, and this could result in different levels of brain masculinisation. Monoamniotic twins share a hormonal environment, but can suffer from the 'twin to twin transfusion syndrome' in which one twin is "relatively stuffed with blood and the other exsanguinated".
Chromosome linkage studies of sexual orientation have indicated the presence of multiple contributing genetic factors throughout the genome. In 1993 Dean Hamer and colleagues published findings from a linkage analysis of a sample of 76 gay brothers and their families. Hamer et al. found that the gay men had more gay male uncles and cousins on the maternal side of the family than on the paternal side. Gay brothers who showed this maternal pedigree were then tested for X chromosome linkage, using twenty-two markers on the X chromosome to test for similar alleles. In another finding, thirty-three of the forty sibling pairs tested were found to have similar alleles in the distal region of Xq28, which was significantly higher than the expected rates of 50% for fraternal brothers. This was popularly dubbed the "gay gene" in the media, causing significant controversy. Sanders et al. in 1998 reported on their similar study, in which they found that 13% of uncles of gay brothers on the maternal side were homosexual, compared with 6% on the paternal side.
A later analysis by Hu et al. replicated and refined the earlier findings. This study revealed that 67% of gay brothers in a new saturated sample shared a marker on the X chromosome at Xq28. Two other studies (Bailey et al., 1999; McKnight and Malcolm, 2000) failed to find a preponderance of gay relatives in the maternal line of homosexual men. One study by Rice et al. in 1999 failed to replicate the Xq28 linkage results. Meta-analysis of all available linkage data indicates a significant link to Xq28, but also indicates that additional genes must be present to account for the full heritability of sexual orientation.
Mustanski et al. (2005) performed a full-genome scan (instead of just an X chromosome scan) on individuals and families previously reported on in Hamer et al. (1993) and Hu et al. (1995), as well as additional new subjects. With the larger sample set and complete genome scan, the study found somewhat reduced linkage for Xq28 than reported by Hamer et al. However, they did find other markers with a likelihood score falling just short of significance at 7q36 and likelihood scores approaching significance at 8p12 and 10q26. Interestingly, 10q26 showed highly significant maternal loading, thus further supporting the previous family studies.
Results from the first large, comprehensive multi-center genetic linkage study of male sexual orientation were reported by an independent group of researchers at the American Society of Human Genetics in 2012. The study population included 409 independent pairs of gay brothers, who were analyzed with over 300,000 single-nucleotide polymorphism markers. The data strongly replicated Hamerʻs Xq28 findings as determined by both two-point and multipoint (MERLIN) LOD score mapping. Significant linkage was also detected in the pericentromeric region of chromosome 8, overlapping with one of the regions detected in the Hamer labʻs previous genomewide study. The authors concluded that "our findings, taken in context with previous work, suggest that genetic variation in each of these regions contributes to development of the important psychological trait of male sexual orientation."
The biology of sexual orientation has been studied in detail in several animal model systems. In the common fruit fly Drosophila melanogaster, the complete pathway of sexual differentiation of the brain and the behaviors it controls is well established in both males and females, providing a concise model of biologically controlled courtship. In mammals, a group of geneticists at the Korea Advanced Institute of Science and Technology altered the sexual preferences of female mice by removing a single gene linked to reproductive behavior. Without the gene, the mice exhibited masculine sexual behavior and attraction toward urine of other female mice. Those mice who retained the gene fucose mutarotase (FucM) were attracted to male mice.
In interviews to the press, researchers have pointed that the evidence of genetic influences should not be equated with genetic determinism. According to Dean Hamer and Michael Bailey, genetic aspects are only one of the multiple causes of homosexuality.
A study suggests linkage between a mother's genetic make-up and homosexuality of her sons. Women have two X chromosomes, one of which is "switched off". The inactivation of the X chromosome occurs randomly throughout the embryo, resulting in cells that are mosaic with respect to which chromosome is active. In some cases though, it appears that this switching off can occur in a non-random fashion. Bocklandt et al. (2006) reported that, in mothers of homosexual men, the number of women with extreme skewing of X chromosome inactivation is significantly higher than in mothers without gay sons. Thirteen percent of mothers with one gay son, and 23% of mothers with two gay sons showed extreme skewing, compared to 4% of mothers without gay sons.
Blanchard and Klassen (1997) reported that each additional older brother increases the odds of a man being gay by 33%. This is now "one of the most reliable epidemiological variables ever identified in the study of sexual orientation." To explain this finding, it has been proposed that male fetuses provoke a maternal immune reaction that becomes stronger with each successive male fetus. This maternal immunization hypothesis (MIH) begins when cells from a male fetus enter the mother's circulation during pregnancy or while giving birth. Male fetuses produce HY antigens which are "almost certainly involved in the sexual differentiation of vertebrates." These Y-linked proteins would not be recognized in the mother's immune system because she is female, causing her to develop antibodies which would travel through the placental barrier into the fetal compartment. From here, the anti-male bodies would then cross the blood/brain barrier (BBB) of the developing fetal brain, altering sex-dimorphic brain structures relative to sexual orientation, increasing the likelihood that the exposed son will be more attracted to men than women. It is this antigen which maternal H-Y antibodies are proposed to both react to and 'remember'. Successive male fetuses are then attacked by H-Y antibodies which somehow decrease the ability of H-Y antigens to perform their usual function in brain masculinisation. However, the theory has been criticized because symptoms which would be typical of such effects are rare compared with the prevalence of homosexuality.
In 2004, Italian researchers conducted a study of about 4,600 people who were the relatives of 98 homosexual and 100 heterosexual men. Female relatives of the homosexual men tended to have more offspring than those of the heterosexual men. Female relatives of the homosexual men on their mother's side tended to have more offspring than those on the father's side. The researchers concluded that there was genetic material being passed down on the X chromosome which both promotes fertility in the mother and homosexuality in her male offspring. The connections discovered would explain about 20% of the cases studied, indicating that this is a highly significant but not the sole genetic factor determining sexual orientation.
Research conducted in Sweden has suggested that gay and straight men respond differently to two odors that are believed to be involved in sexual arousal. The research showed that when both heterosexual women (lesbians were included in the study, but the results regarding them were "somewhat confused") and gay men are exposed to a testosterone derivative found in men's sweat, a region in the hypothalamus is activated. Heterosexual men, on the other hand, have a similar response to an estrogen-like compound found in women's urine. The conclusion is that sexual attraction, whether same-sex or opposite-sex oriented, operates similarly on a biological level. Researchers have suggested that this possibility could be further explored by studying young subjects to see if similar responses in the hypothalamus are found and then correlating these data with adult sexual orientation.
Studies of brain structure
A number of sections of the brain have been reported to be sexually dimorphic; that is, they vary between men and women. There have also been reports of variations in brain structure corresponding to sexual orientation. In 1990, Dick Swaab and Hofman reported a difference in the size of the suprachiasmatic nucleus between homosexual and heterosexual men. In 1992, Allen and Gorski reported a difference related to sexual orientation in the size of the anterior commissure.
Sexually dimorphic nuclei in the anterior hypothalamus
Simon LeVay, too, conducted some of these early researches. He studied four groups of neurons in the hypothalamus called INAH1, INAH2, INAH3 and INAH4. This was a relevant area of the brain to study, because of evidence that it played a role in the regulation of sexual behaviour in animals, and because INAH2 and INAH3 had previously been reported to differ in size between men and women.
He obtained brains from 41 deceased hospital patients. The subjects were classified into three groups. The first group comprised 19 gay men who had died of AIDS-related illnesses. The second group comprised 16 men whose sexual orientation was unknown, but whom the researchers presumed to be heterosexual. Six of these men had died of AIDS-related illnesses. The third group was of six women whom the researchers presumed to be heterosexual. One of the women had died of an AIDS-related illness.
The HIV-positive people in the presumably heterosexual patient groups were all identified from medical records as either intravenous drug abusers or recipients of blood transfusions. Two of the men who identified as heterosexual specifically denied ever engaging in a homosexual sex act. The records of the remaining heterosexual subjects contained no information about their sexual orientation; they were assumed to have been primarily or exclusively heterosexual "on the basis of the numerical preponderance of heterosexual men in the population."
LeVay found no evidence for a difference between the groups in the size of INAH1, INAH2 or INAH4. However, the INAH3 group appeared to be twice as big in the heterosexual male group as in the gay male group; the difference was highly significant, and remained significant when only the six AIDS patients were included in the heterosexual group. The size of INAH3 in the homosexual men's brains was comparable to the size of INAH3 in the heterosexual women's brains.
William Byne and colleagues attempted to identify the size differences reported in INAH 1-4 by replicating the experiment using brain sample from other subjects: 14 HIV-positive homosexual males, 34 presumed heterosexual males (10 HIV-positive), and 34 presumed heterosexual females (9 HIV-positive). The researchers found a significant difference in INAH3 size between heterosexual men and heterosexual women. The INAH3 size of the homosexual men was apparently smaller than that of the heterosexual men, and larger than that of the heterosexual women, though neither difference quite reached statistical significance.
Byne and colleagues also weighed and counted numbers of neurons in INAH3 tests not carried out by LeVay. The results for INAH3 weight were similar to those for INAH3 size; that is, the INAH3 weight for the heterosexual male brains was significantly larger than for the heterosexual female brains, while the results for the gay male group were between those of the other two groups but not quite significantly different from either. The neuron count also found a male-female difference in INAH3, but found no trend related to sexual orientation.
A 2010 study, Garcia-Falgueras and Swaab asserted that "the fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. In this way, our gender identity (the conviction of belonging to the male or female gender) and sexual orientation are programmed or organized into our brain structures when we are still in the womb. There is no indication that social environment after birth has an effect on gender identity or sexual orientation."
The ovine model
The domestic ram is used as an experimental model to study early programming of the neural mechanisms which underlie homosexuality, developing from the observation that approximately 8% of domestic rams are sexually attracted to other rams (male-oriented) when compared to the majority of rams which are female-oriented. In many species, a prominent feature of sexual differentiation is the presence of a sexually dimorphic nucleus (SDN) in the preoptic hypothalamus, which is larger in males than in females.
Roselli et al. discovered an ovine SDN (oSDN) in the preoptic hypothalamus that is smaller in male-oriented rams than in female-oriented rams, but similar in size to the oSDN of females. Neurons of the oSDN show aromatase expression which is also smaller in male-oriented rams versus female-oriented rams, suggesting that sexual orientation is neurologically hard-wired and may be influenced by hormones. However, results failed to associate the role of neural aromatase in the sexual differentiation of brain and behavior in the sheep, due to the lack of defeminization of adult sexual partner preference or oSDN volume as a result of aromatase activity in the brain of the fetuses during the critical period. Having said this, it is more likely that oSDN morphology and homosexuality may be programmed through an androgen receptor that does not involve aromatisation. Most of the data suggests that homosexual rams, like female-oriented rams, are masculinized and defeminized with respect to mounting, receptivity, and gonadotrophin secretion, but are not defeminized for sexual partner preferences, also suggesting that such behaviors may be programmed differently. Although the exact function of the oSDN is not fully known, its volume, length, and cell number seem to correlate with sexual orientation, and a dimorphism in its volume and of cells could bias the processing cues involved in partner selection. More research is needed in order to understand the requirements and timing of the development of the oSDN and how prenatal programming effects the expression of mate choice in adulthood.
Biological theories of etiology of sexual orientation
Early fixation hypothesis
The early fixation hypothesis includes research into prenatal development and the environmental factors that control masculinization of the brain. Some studies have seen pre-natal hormone exposures as the primary factor involved in determining sexual orientation. This hypothesis is supported by both the observed differences in brain structure and cognitive processing between homosexual and heterosexual men. One explanation for these differences is the idea that differential exposure to hormone levels in the womb during fetal development may change the masculinization of the brain in homosexual men. The concentrations of these chemicals is thought to be influenced by fetal and maternal immune systems, maternal consumption of certain drugs, maternal stress, and direct injection. This hypothesis is also connected to the fraternal birth order research.
Exotic becomes erotic
Daryl Bem, a social psychologist at Cornell University, has theorized that the influence of biological factors on sexual orientation may be mediated by experiences in childhood. A child's temperament predisposes the child to prefer certain activities over others. Because of their temperament, which is influenced by biological variables such as genetic factors, some children will be attracted to activities that are commonly enjoyed by other children of the same gender. Others will prefer activities that are typical of another gender. This will make a gender-conforming child feel different from opposite-gender children, while gender-nonconforming children will feel different from children of their own gender. According to Bem, this feeling of difference will evoke psychological arousal when the child is near members of the gender which it considers as being 'different'. Bem theorizes that this psychological arousal will later be transformed into sexual arousal: children will become sexually attracted to the gender which they see as different ("exotic"). This theory is known as Exotic Becomes Erotic theory.
The theory is based in part on the frequent finding that a majority of gay men and lesbians report being gender-nonconforming during their childhood years. A meta-analysis of 48 studies showed childhood gender nonconformity to be the strongest predictor of a homosexual orientation for both men and women. Fourteen studies published since Bailey & Zucker's 1995 also show the same results. In one study by the Kinsey Institute of approximately 1000 gay men and lesbians (and a control group of 500 heterosexual men and women), 63% of both gay men and lesbians reported that they were gender nonconforming in childhood (i.e., did not like activities typical of their sex), compared with only 10–15% of heterosexual men and women. There are also six "prospective" studies—that is longitudinal studies that begin with gender-nonconforming boys at about age 7 and follow them up into adolescence and adulthood. These also show that a majority (63%) of the gender nonconforming boys become gay or bisexual as adults. There are very few prospective studies of gender nonconforming girls. In a group of eighteen behaviorally masculine girls (mean age of assessment: 9 years), all reported a homosexual sexual orientation at adolescence, and eight had requested sex reassignment.
William Reiner, a psychiatrist and urologist with the University of Oklahoma has evaluated more than a hundred cases of children born with sexual differentiation disorders. In the 1960s and '70s, it was common in developed countries for doctors to castrate boys born with a micropenis and have them raised as girls. However, this practice has come under attack, because even though these boys were raised as girls, they nearly all report as adults that they are sexually attracted to women. This suggests that their sexual orientation was determined at or before birth.
Sexual orientation and evolution
Sexual practices that significantly reduce the frequency of heterosexual intercourse also significantly decrease the chances of successful reproduction, and for this reason, they would appear to be maladaptive in an evolutionary context following a simple Darwinian model of natural selection—on the assumption that homosexuality would reduce this frequency. Several theories have been advanced to explain this contradiction, and new experimental evidence has demonstrated their feasibility.
Some scholars have suggested that homosexuality is adaptive in a non-obvious way. By way of analogy, the allele (a particular version of a gene) which causes sickle-cell anemia when two copies are present may also confer resistance to malaria with a lesser form of anemia when one copy is present (this is called heterozygous advantage).
The so-called "gay uncle" hypothesis posits that people who themselves do not have children may nonetheless increase the prevalence of their family's genes in future generations by providing resources (food, supervision, defense, shelter, etc.) to the offspring of their closest relatives. This hypothesis is an extension of the theory of kin selection. Kin selection was originally developed to explain apparent altruistic acts which seemed to be maladaptive. The initial concept was suggested by J.B.S. Haldane in 1932 and later elaborated by many others including John Maynard Smith, W. D. Hamilton and Mary Jane West-Eberhard. This concept was also used to explain the patterns of certain social insects where most of the members are non-reproductive.
Brendan Zietsch of the Queensland Institute of Medical Research proposes the alternative theory that men exhibiting female traits become more attractive to females and are thus more likely to mate, provided the genes involved do not drive them to complete rejection of heterosexuality.
In a 2008 study, its authors stated that "There is considerable evidence that human sexual orientation is genetically influenced, so it is not known how homosexuality, which tends to lower reproductive success, is maintained in the population at a relatively high frequency." They hypothesized that "while genes predisposing to homosexuality reduce homosexuals' reproductive success, they may confer some advantage in heterosexuals who carry them." and their results suggested that "genes predisposing to homosexuality may confer a mating advantage in heterosexuals, which could help explain the evolution and maintenance of homosexuality in the population.". However, in the same study, the authors noted that "nongenetic alternative explanations cannot be ruled out" as a reason for the heterosexual in the homosexual-heterosexual twin pair having more partners, specifically citing "social pressure on the other twin to act in a more heterosexual way" (and thus seek out a greater number of sexual partners) as an example of one alternative explanation. Also, the authors of the study acknowledge that a large number of sexual partners may not lead to greater reproductive success, specifically noting there is an "absence of evidence relating the number of sexual partners and actual reproductive success, either in the present or in our evolutionary past."
The heterosexual advantage hypothesis was given strong support by the 2004 Italian study demonstrating increased fecundity in the female matrilineal relatives of gay men. As originally pointed out by Hamer, even a modest increase in reproductive capacity in females carrying a "gay gene" could easily account for its maintenance at high levels in the population.
Biological differences in gay men and lesbian women
Some studies have found correlations between physiology of people and their sexuality; these studies provide evidence which suggests that:
- Gay men and straight women have, on average, equally proportioned brain hemispheres. Lesbian women and straight men have, on average, slightly larger right brain hemispheres.
- The VIP SCN nucleus of the hypothalamus is larger in men than in women, and larger in gay men than in heterosexual men.
- Gay men report, on an average, slightly longer and thicker penises than non-gay men.
- The average size of the INAH-3 in the brains of gay men is approximately the same size as INAH 3 in women, which is significantly smaller, and the cells more densely packed, than in heterosexual men's brains.
- The anterior commissure is larger in women than men and was reported to be larger in gay men than in non-gay men, but a subsequent study found no such difference.
- Gay men's brains respond differently to fluoxetine, a selective serotonin reuptake inhibitor.
- The functioning of the inner ear and the central auditory system in lesbians and bisexual women are more like the functional properties found in men than in non-gay women (the researchers argued this finding was consistent with the prenatal hormonal theory of sexual orientation).
- The suprachiasmatic nucleus was found by Swaab and Hopffman to be larger in gay men than in non-gay men, the suprachiasmatic nucleus is also known to be larger in men than in women.
- The startle response (eyeblink following a loud sound) is similarly masculinized in lesbians and bisexual women.
- Gay and non-gay people's brains respond differently to two putative sex pheromones (AND, found in male armpit secretions, and EST, found in female urine).
- The amygdala, a region of the brain, is more active in gay men than non-gay men when exposed to sexually arousing material.
- Finger length ratios between the index and ring fingers have been reported to differ, on average, between non-gay and lesbian women.
- Gay men and lesbians are significantly more likely to be left-handed or ambidextrous than non-gay men and women; Simon LeVay argues that because "[h]and preference is observable before birth... [t]he observation of increased non-right-handness in gay people is therefore consistent with the idea that sexual orientation is influenced by prenatal processes," perhaps heredity.
- A study of over 50 gay men found that about 23% had counterclockwise hair whorl, as opposed to 8% in the general population. This may correlate with left-handedness.
- Gay men have increased ridge density in the fingerprints on their left thumbs and pinkies.
- Length of limbs and hands of gay men is smaller compared to height than the general population, but only among white men.
Recent studies suggest the presence of subtle differences in the way gay people and non-gay people process certain kinds of information. Researchers have found that:
- Gay men and lesbians may be more verbally fluent than heterosexuals of the same sex (but two studies did not find this result).
- Gay men may receive higher scores than non-gay men on tests of object location memory (no difference was found between lesbians and non-gay women).
Whether genetic or other physiological determinants form the basis of sexual orientation is a highly politicized issue. The Advocate, a U.S. gay and lesbian newsmagazine, reported in 1996 that 61% of its readers believed that "it would mostly help gay and lesbian rights if homosexuality were found to be biologically determined". A cross-national study in the United States, the Philippines, and Sweden found that those who believed that "homosexuals are born that way" held significantly more positive attitudes toward homosexuality than those who believed that "homosexuals choose to be that way" or "learn to be that way".
Equal protection analysis in U.S. law determines when government requirements create a “suspect classification" of groups and therefore eligible for heightened scrutiny based on several factors, one of which is immutability.
Evidence that sexual orientation is biologically determined (and therefore perhaps immutable in the legal sense) would strengthen the legal case for heightened scrutiny of laws discriminating on that basis.
The perceived causes of sexual orientation have a significant bearing on the status of sexual minorities in the eyes of social conservatives. The Family Research Council, a conservative Christian think tank in Washington, D.C., argues in the book Getting It Straight that finding people are born gay "would advance the idea that sexual orientation is an innate characteristic, like race; that homosexuals, like African-Americans, should be legally protected against 'discrimination;' and that disapproval of homosexuality should be as socially stigmatized as racism. However, it is not true." On the other hand, some social conservatives such as Reverend Robert Schenck have argued that people can accept any scientific evidence while still morally opposing homosexuality. As well, National Organization for Marriage board member and fiction writer Orson Scott Card has supported biological research on homosexuality, writing that "our scientific efforts in regard to homosexuality should be to identify genetic and uterine causes... so that the incidence of this dysfunction can be minimized.... [However, this should not be seen] as an attack on homosexuals, a desire to 'commit genocide' against the homosexual community.... There is no 'cure' for homosexuality because it is not a disease. There are, however, different ways of living with homosexual desires."
Some advocates for the rights of sexual minorities resist linking that cause with the concept that sexuality is biologically determined or fixed at birth. They argue that sexual orientation can shift over the course of a person's life. At the same time, others resist any attempts to pathologise or medicalise 'deviant' sexuality, and choose to fight for acceptance in a moral or social realm. Chandler Burr has stated that "[s]ome, recalling earlier psychiatric "treatments" for homosexuality, discern in the biological quest the seeds of genocide. They conjure up the specter of the surgical or chemical "rewiring" of gay people, or of abortions of fetal homosexuals who have been hunted down in the womb." LeVay has said in response to letters from gays and lesbians making such criticisms that the research "has contributed to the status of gay people in society."
- Against Nature?
- Alfred Kinsey
- Arnold Aletrino
- Environment and sexual orientation
- Epigenetic theories of homosexuality
- Gay bomb
- Homosexual behavior in animals
- Mental roots of sexual orientation
- Neuroscience and sexual orientation
- Norms of reaction
- Frankowski BL; American Academy of Pediatrics Committee on Adolescence (June 2004). "Sexual orientation and adolescents". Pediatrics 113 (6): 1827–32. doi:10.1542/peds.113.6.1827. PMID 15173519.
- Långström, Niklas; Qazi Rahman, Eva Carlström, Paul Lichtenstein. (7 June 2008). "Genetic and Environmental Effects on Same-sex Sexual Behaviour: A Population Study of Twins in Sweden". Archives of Sexual Behavior (Archives of Sexual Behavior) 39 (1): 75–80. doi:10.1007/s10508-008-9386-1. PMID 18536986.
- "Submission to the Church of England’s Listening Exercise on Human Sexuality". The Royal College of Psychiatrists. Retrieved 13 June 2013.
- Bailey JM, Pillard, RC (1991). "A Genetic Study of Male Sexual Orientation". Archives of General Psychiatry 48 (12): 1089–96. doi:10.1001/archpsyc.1991.01810360053008. PMID 1845227.
- Bailey JM, Dunne MP, Martin NG (March 2000). "Genetic and environmental influences on sexual orientation and its correlates in an Australian twin sample". J Pers Soc Psychol 78 (3): 524–36. doi:10.1037/0022-3518.104.22.1684. PMID 10743878.
- Hershberger, Scott L. 2001. Biological Factors in the Development of Sexual Orientation. Pp. 27–51 in Lesbian, Gay, and Bisexual Identities and Youth: Psychological Perspectives, edited by Anthony R. D’Augelli and Charlotte J. Patterson. Oxford, New York: Oxford University Press. Quoted in Bearman and Bruckner, 2002.
- This work was published in the American Journal of Sociology (Bearman, P. S. & Bruckner, H. (2002) Opposite-sex twins and adolescent same-sex attraction. American Journal of Sociology 107, 1179–1205.) and is available only to subscribers. However, a final draft of the paper is available here – there are no significant differences on the points cited between the final draft and the published version.
- While inconsistent with modern findings, the first relatively large-scale twin study on sexual orientation was reported by Kallman in 1952. (See: Kallmann FJ (April 1952). "Comparative twin study on the genetic aspects of male homosexuality". J. Nerv. Ment. Dis. 115 (4): 283–97. PMID 14918012.). Examining only male twin pairs, he found a 100% concordance rate for homosexuality among 37 monozygotic (MZ) twin pairs, compared to a 12%–42% concordance rate among 26 dizygotic (DZ) twin pairs, depending on definition. In other words, every identical twin of a homosexual subject was also homosexual, while this was not the case for non-identical twins. This study was criticized for its vaguely described method of recruiting twins and for a high rate of psychiatric disorders among its subjects. (See Rosenthal, D., "Genetic Theory and Abnormal Behavior" 1970, New York: McGraw-Hill.)
- Långström N, Rahman Q, Carlström E, Lichtenstein P (February 2010). "Genetic and environmental effects on same-sex sexual behavior: a population study of twins in Sweden". Arch Sex Behav 39 (1): 75–80. doi:10.1007/s10508-008-9386-1. PMID 18536986.
- Schacter, Daniel L., Gilbert, Daniel T., and Wegner, Daniel M. (2009) "Psychology". Worth Publishers: 435.
- Gringas, P.; Chen, W. (2001). "Mechanisms for difference in monozygous twins". Early Human Development 64 (2): 105–117. doi:10.1016/S0378-3782(01)00171-2. PMID 11440823.
- Rutter, M. (2006). Genes and Behavior. Oxford, UK: Blackwell Publishing.
- Hamer DH, Hu S, Magnuson VL, Hu N, Pattatucci AM (July 1993). "A linkage between DNA markers on the X chromosome and male sexual orientation". Science 261 (5119): 321–7. doi:10.1126/science.8332896. PMID 8332896.
- Wilson, G.D., & Rahman, Q. (2005). Born Gay: The Biology of Sex Orientation. London: Peter Owen Publishers.
- Hu S, Pattatucci AM, Patterson C, et al. (November 1995). "Linkage between sexual orientation and chromosome Xq28 in males but not in females". Nat. Genet. 11 (3): 248–56. doi:10.1038/ng1195-248. PMID 7581447.
- Vilain E (2000). "Genetics of sexual development". Annu Rev Sex Res 11: 1–25. PMID 11351829.
- Mustanski BS, Dupree MG, Nievergelt CM, Bocklandt S, Schork NJ, Hamer DH (March 2005). "A genomewide scan of male sexual orientation" (PDF). Hum. Genet. 116 (4): 272–8. doi:10.1007/s00439-004-1241-4. PMID 15645181.
- Genome-wide linkage scan of male sexual orientation. A. R. Sanders, K. Dawood, G. Rieger, J. A. Badner, E. S. Gershon, R. S. Krishnappa, A. B. Kolundzija, S. Guo, G. W. Beecham, E. R. Martin, J.M. Bailey8, Abstract 1957T
- Pavlou HJ, Goodwin SF (February 2013). "Courtship behavior in Drosophila melanogaster: towards a 'courtship connectome'". Current Opinion in Neurobiology 23 (1): 76–83. doi:10.1016/j.conb.2012.09.002. PMC 3563961. PMID 23021897.
- Park, D; Choi, D; Lee, J; Lim, DS; Park, C (2010). "Male-like sexual behavior of female mouse lacking fucose mutarotase". BMC genetics 11: 62. doi:10.1186/1471-2156-11-62. PMC 2912782. PMID 20609214.
- http://www.independent.co.uk/news/the-gay-gene-is-back-on-the-scene-1536770.html[full citation needed]
- http://www.telegraph.co.uk/science/science-news/10637532/Being-homosexual-is-only-partly-due-to-gay-gene-research-finds.html[full citation needed]
- Bocklandt S, Horvath S, Vilain E, Hamer DH (February 2006). "Extreme skewing of X chromosome inactivation in mothers of homosexual men". Hum. Genet. 118 (6): 691–4. doi:10.1007/s00439-005-0119-4. PMID 16369763.
- Blanchard R, Klassen P (April 1997). "H-Y antigen and homosexuality in men". J. Theor. Biol. 185 (3): 373–8. doi:10.1006/jtbi.1996.0315. PMID 9156085.
- Pas de Deux of Sexuality Is Written in the Genes
- Blanchard R (1997). "Birth order and sibling sex ratio in homosexual versus heterosexual males and females". Annu Rev Sex Res 8: 27–67. PMID 10051890.
- Anthony F. Bogaert & Malvina Skorska (April 2011). "Sexual orientation, fraternal birth order, and the maternal immune hypothesis: a review". Frontiers in neuroendocrinology 32 (2): 247–254. doi:10.1016/j.yfrne.2011.02.004. PMID 21315103.
- Whitehead NE (2007). "An antiboy antibody? Re-examination of the maternal immune hypothesis". J Biosocial Sci 39 (6): 905–921. doi:10.1017/S0021932007001903. PMID 17316469.
- Camperio-Ciani A, Corna F, Capiluppi C (November 2004). "Evidence for maternally inherited factors favouring male homosexuality and promoting female fecundity". Proc. Biol. Sci. 271 (1554): 2217–21. doi:10.1098/rspb.2004.2872. PMC 1691850. PMID 15539346.
- Savic I, Berglund H, Lindström P (May 2005). "Brain response to putative pheromones in homosexual men". Proc. Natl. Acad. Sci. U.S.A. 102 (20): 7356–61. doi:10.1073/pnas.0407998102. PMC 1129091. PMID 15883379.
- Wade, Nicholas. (May 9, 2005). "Gay Men Are Found to Have Different Scent of Attraction." New York Times.
- Swaab DF, Hofman MA (December 1990). "An enlarged suprachiasmatic nucleus in homosexual men". Brain Res. 537 (1–2): 141–8. doi:10.1016/0006-8993(90)90350-K. PMID 2085769.
- Allen LS, Gorski RA (August 1992). "Sexual orientation and the size of the anterior commissure in the human brain". Proc. Natl. Acad. Sci. U.S.A. 89 (15): 7199–202. doi:10.1073/pnas.89.15.7199. PMC 49673. PMID 1496013.
- LeVay S (August 1991). "A difference in hypothalamic structure between heterosexual and homosexual men". Science 253 (5023): 1034–7. doi:10.1126/science.1887219. PMID 1887219.
- Byne W, Tobet S, Mattiace LA, et al. (September 2001). "The interstitial nuclei of the human anterior hypothalamus: an investigation of variation with sex, sexual orientation, and HIV status". Horm Behav 40 (2): 86–92. doi:10.1006/hbeh.2001.1680. PMID 11534967.
- Garcia-Falgueras A, Swaab DF (2010). "Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation". Endocr Dev. Endocrine Development 17: 22–35. doi:10.1159/000262525. ISBN 978-3-8055-9302-1. PMID 19955753.
- C. E. Roselli & F. Stormshak (March 2009). "Prenatal programming of sexual partner preference: the ram model". Journal of Neuroendocrinology 21 (4): 359–364. doi:10.1111/j.1365-2826.2009.01828.x. PMC 2668810. PMID 19207819.
- Garcia-Falgueras, Alicia, & Swaab, Dick F., Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation, in Endocrine Development, vol. 17, pp. 22–35 (2010) (ISSN 1421-7082) (authors are of Netherlands Institute for Neuroscience, of Royal Netherlands Academy of Arts and Sciences) (author contact is 2d author) (vol. 17 is Sandro Loche, Marco Cappa, Lucia Ghizzoni, Mohamad Maghnie, & Martin O. Savage, eds., Pediatric Neuroendocrinology).
- Wilson, G.D. & Rahman, Q (2005) Born Gay: The Psychobiology of Sex Orientation, Peter Owen, London
- Brodie HK, Gartrell N, Doering C, Rhue T (January 1974). "Plasma testosterone levels in heterosexual and homosexual men". Am J Psychiatry 131 (1): 82–3. PMID 4808435.
- Bem DJ, Herdt G, McClintock M (December 2000). "Exotic becomes erotic: interpreting the biological correlates of sexual orientation". Arch Sex Behav 29 (6): 531–48. doi:10.1023/A:1002050303320. PMID 11100261. PDF
- Bailey, J.M.; Zucker, K.J. (1995). "Childhood sex-typed behavior and sexual orientation: A conceptual analysis and quantitative review". Developmental Psychology 31 (1): 43–55. doi:10.1037/0012-1622.214.171.124.
- Zucker, K.J. (2005) Commentary on Gottschalk’s (2003) ‘Same-sex sexuality and childhood gender non-conformity: A spurious connection’ Journal of Gender Studies, 14:55–60.
- Zucker, K.J. (1990) Gender identity disorders in children: clinical descriptions and natural history. p.1–23 in R. Blanchard & B.W. Steiner (eds) Clinical management of gender identity disorders in children and adults. Washington DC, American Psychiatric Press.
- Green R (January 1979). "Childhood cross-gender behavior and subsequent sexual preference". Am J Psychiatry 136 (1): 106–8. PMID 758811.
- Cohen-Kettenis PT (April 2001). "Gender identity disorder in DSM?". J Am Acad Child Adolesc Psychiatry 40 (4): 391. doi:10.1097/00004583-200104000-00006. PMID 11314563.
- Cohen-Kettenis, P. T. (2001) Gender identity disorder in DSM? [Letter to the editor], Journal of the American Academy of Child and Adolescent Psychiatry, 40, p. 391. and comments reported in: Zucker, K.J. (2005) Commentary on Gottschalk’s (2003) ‘Same-sex sexuality and childhood gender non-conformity: A spurious connection’ Journal of Gender Studies, 14:55–60.
- : "Those raised as girls, says Reiner, 'had terrible genital self-esteem.' The older children were not dating. 'If you pin them down, they say they're attracted to girls. But it's not acceptable to them to be homosexual.'"
- MacIntyre F, Estep KW (1993). "Sperm competition and the persistence of genes for male homosexuality". BioSystems 31 (2–3): 223–33. doi:10.1016/0303-2647(93)90051-D. PMID 8155854.
- Baker, Robin (1996) Sperm Wars: The Science of Sex, p.241 ff.
- Mayr, E. (1982). The Growth of Biological Thought: Diversity, Evolution, and Inheritance. Cambridge: Harvard University Press. p598.
- How homosexuality may have evolved
- Zietsch, B., Morley, K., Shekar, S., Verweij, K., Keller, M., Macgregor, S., et al. (November 2008). "Genetic factors predisposing to homosexuality may increase mating success in heterosexuals". Evolution and Human Behavior 29 (6): 424–433. doi:10.1016/j.evolhumbehav.2008.07.002.
- Hamer, D., Copeland, P. The Science of Desire: The Search for the Gay Gene and the Biology of Behavior (Simon and Schuster, 1994) ISBN 0-684-80446-8
- Scans see 'gay brain differences' – BBC News
- Evolution's Rainbow: Diversity, Gender, and Sexuality in Nature and People. Contributors: Joan Roughgarden – author. Publisher: University of California Press. Place of Publication: Berkeley, CA. Publication Year: 2004. Page Number: 245.
- Bogaert AF, Hershberger S (1999). "The relation between sexual orientation and penile size". Arch Sex Behav 28 (3): 213–21. doi:10.1023/A:1018780108597. PMID 10410197.
- Lasco, M. S.; Jordan, T. J.; Edgar, M. A.; Petito, C. K.; Byne, W. (2002). "A lack of dimorphism of sex or sexual orientation in the human anterior commissure". Brain Research 936 (1–2): 95–98. doi:10.1016/S0006-8993(02)02590-8. PMID 11988236.
- Kinnunen LH, Moltz H, Metz J, Cooper M (2004). "Differential brain activation in exclusively homosexual and heterosexual men produced by the selective serotonin reuptake inhibitor, fluoxetine". Brain Res. 1024 (1–2): 251–4. doi:10.1016/j.brainres.2004.07.070. PMID 15451388.
- McFadden D (2002). "Masculinization effects in the auditory system". Arch Sex Behav 31 (1): 99–111. doi:10.1023/A:1014087319682. PMID 11910797.
- Swaab DF, Zhou JN, Ehlhart T, Hofman MA (1994). "Development of vasoactive intestinal polypeptide neurons in the human suprachiasmatic nucleus in relation to birth and sex". Brain Res. Dev. Brain Res. 79 (2): 249–59. doi:10.1016/0165-3806(94)90129-5. PMID 7955323.
- Rahman Q, Kumari V, Wilson GD (2003). "Sexual orientation-related differences in prepulse inhibition of the human startle response". Behav. Neurosci. 117 (5): 1096–102. doi:10.1037/0735-7044.117.5.1096. PMID 14570558.
- Savic I, Berglund H, Gulyas B, Roland P (2001). "Smelling of odorous sex hormone-like compounds causes sex-differentiated hypothalamic activations in humans". Neuron 31 (4): 661–8. doi:10.1016/S0896-6273(01)00390-7. PMID 11545724.
- Berglund H, Lindström P, Savic I (2006). "Brain response to putative pheromones in lesbian women". Proc. Natl. Acad. Sci. U.S.A. 103 (21): 8269–74. doi:10.1073/pnas.0600331103. PMC 1570103. PMID 16705035.
- Safron A, Barch B, Bailey JM, Gitelman DR, Parrish TB, Reber PJ (2007). "Neural correlates of sexual arousal in homosexual and heterosexual men". Behav. Neurosci. 121 (2): 237–48. doi:10.1037/0735-7044.121.2.237. PMID 17469913.. The authors of the study caution that any interpretation of this finding must take into account that the group difference in brain activation between heterosexual men and homosexual men in the amygdala region is not large and that the most robust finding is that both heterosexual and homosexual men used the same areas when they reacted to sexually preferred stimuli. "For the most part, homosexual and heterosexual men showed very similar patterns of activation (albeit to different erotic stimuli). One possible exception was the amygdala, in which homosexual men showed greater activational differences between preferred and nonpreferred erotic stimuli compared with heterosexual men. However, this difference was not hypothesized a priori, was not large, and was the only group difference found out of many tested. Thus, this finding needs replication."(Debra A. Hope (editor), What is Sexual Orientation and Do Women Have One? (presentation by J.M. Bailey), Nebraska Symposium on Motivation, Volume 54 p. 47, Springer Science, 2009.)
- Williams TJ, Pepitone ME, Christensen SE et al. (March 2000). "Finger-length ratios and sexual orientation". Nature 404 (6777): 455–6. doi:10.1038/35006555. PMID 10761903.
- Tortorice JL (2002). Written on the body: butch vs. femme lesbian gender identity and biological correlates of low digit ratio. Rutgers University. OCLC 80234273.
- Hall LS, Love CT (February 2003). "Finger-length ratios in female monozygotic twins discordant for sexual orientation". Archives of Sexual Behavior 32 (1): 23–8. doi:10.1023/A:1021837211630. PMID 12597269.
- Rahman Q, Wilson GD (April 2003). "Sexual orientation and the 2nd to 4th finger length ratio: evidence for organising effects of sex hormones or developmental instability?". Psychoneuroendocrinology 28 (3): 288–303. doi:10.1016/S0306-4530(02)00022-7. PMID 12573297.
- Putz, David A.; Gaulin, Steven J. C.; Sporter, Robert J.; McBurney, Donald H. (May 2004). "Sex hormones and finger length: What does 2D:4D indicate?". Evolution and Human Behavior 25 (3): 182–99. doi:10.1016/j.evolhumbehav.2004.03.005.
- Rahman Q (May 2005). "Fluctuating asymmetry, second to fourth finger length ratios and human sexual orientation". Psychoneuroendocrinology 30 (4): 382–91. doi:10.1016/j.psyneuen.2004.10.006. PMID 15694118.
- Kraemer B, Noll T, Delsignore A, Milos G, Schnyder U, Hepp U (2006). "Finger length ratio (2D:4D) and dimensions of sexual orientation". Neuropsychobiology 53 (4): 210–4. doi:10.1159/000094730. PMID 16874008.
- Wallien MS, Zucker KJ, Steensma TD, Cohen-Kettenis PT (August 2008). "2D:4D finger-length ratios in children and adults with gender identity disorder". Hormones and Behavior 54 (3): 450–4. doi:10.1016/j.yhbeh.2008.05.002. PMID 18585715.
- Grimbos T, Dawood K, Burriss RP, Zucker KJ, Puts DA (2010). "Sexual orientation and the second to fourth finger length ratio: a meta-analysis in men and women". Behav Neurosci 124 (2): 278–287. doi:10.1037/a0018764. PMID 20364887.
- Hirashi K, Sasaki S, Shikishima C, Ando J (Jun 2012). "The second to fourth digit ratio (2D:4D) in a Japanese twin sample: heritability, prenatal hormone transfer, and association with sexual orientation". Arch Sex Behav 41 (3): 711–24. doi:10.1007/s10508-011-9889-z. PMID 22270254.
- Lalumière ML, Blanchard R, Zucker KJ (2000). "Sexual orientation and handedness in men and women: a meta-analysis". Psychol Bull 126 (4): 575–92. doi:10.1037/0033-2909.126.4.575. PMID 10900997.
- Mustanski BS, Bailey JM, Kaspar S (2002). "Dermatoglyphics, handedness, sex, and sexual orientation". Arch Sex Behav 31 (1): 113–22. doi:10.1023/A:1014039403752. PMID 11910784.
- Lippa RA (2003). "Handedness, sexual orientation, and gender-related personality traits in men and women". Arch Sex Behav 32 (2): 103–14. doi:10.1023/A:1022444223812. PMID 12710825.
- Hepper PG, Shahidullah S, White R (1991). "Handedness in the human fetus". Neuropsychologia 29 (11): 1107–11. doi:10.1016/0028-3932(91)90080-R. PMID 1775228.
- The Science of Gaydar by David France. New York Magazine. 18 June 2007.
- Geoff Sanders, Ph.D. and Marian Wright, B.Sc. (1997), Sexual Orientation Differences in Cerebral Asymmetry and in the Performance of Sexually Dimorphic Cognitive and Motor Tasks
- GSS data on verbal performance of homosexual, heterosexual, and bisexual males and females
- McCormick CM, Witelson SF (1991). "A cognitive profile of homosexual men compared to heterosexual men and women". Psychoneuroendocrinology 16 (6): 459–73. doi:10.1016/0306-4530(91)90030-W. PMID 1811244.
- Rahman Q, Abrahams S, Wilson GD (2003). "Sexual-orientation-related differences in verbal fluency". Neuropsychology 17 (2): 240–6. doi:10.1037/0894-4126.96.36.199. PMID 12803429.
- Gladue, B. A., W. W. Beatty, et al. (1990). "Sexual orientation and spatial ability in men and women." Psychobiology 18: 101–108.
- Neave N, Menaged M, Weightman DR (1999). "Sex differences in cognition: the role of testosterone and sexual orientation". Brain Cogn 41 (3): 245–62. doi:10.1006/brcg.1999.1125. PMID 10585237.
- Rahman Q, Wilson GD, Abrahams S (2003). "Sexual orientation related differences in spatial memory". J Int Neuropsychol Soc 9 (3): 376–83. doi:10.1017/S1355617703930037. PMID 12666762.
- The Advocate (1996, February 6). Advocate Poll Results. p. 8.
- Ernulf KE, Innala SM, Whitam FL (December 1989). "Biological explanation, psychological explanation, and tolerance of homosexuals: a cross-national analysis of beliefs and attitudes". Psychol Rep 65 (3 Pt 1): 1003–10. doi:10.2466/pr0.19188.8.131.523. PMID 2608821.
- Whitley B. E. Jr (1990). "The relationship of heterosexuals' attributions for the causes of homosexuality to attitudes toward lesbians and gay men". Personality and Social Psychology Bulletin 16 (2): 369–377. doi:10.1177/0146167290162016.
- Balog, Kari (2005–2006) "Equal Protection for Homosexuals: Why the Immutability Argument is Necessary and How it is Met.", Cleveland St. L. Rev. 545–573.
- "Is Sexuality Immutable?", Margaret Talbot, The New Yorker, January 25, 2010.
- "Prop. 8 trial: defenders of gay-marriage ban make their case". Christian Science Monitor. Retrieved 27 January 2010.
- What Makes People Gay? By Neil Swidey. The Boston Globe. Published August 14, 2005. Accessed June 18, 2009.
- Card, Orson Scott (August 7, 2008). "Science on gays falls short". Deseret Morning News. Retrieved June 12, 2010.
- Myths About Queer by Choice People. Queer by Choice. Accessed March 6, 2009.
- Homosexuality and Biology. By Chandler Burr. The Atlantic Monthly. June 2007.
- Anders Agmo Functional and dysfunctional sexual behavior Elsevier 2007
- Serge Wunsch PhD thesis about sexual behavior Paris Sorbonne 2007
- BBC (April 23, 1999). Doubt cast on 'gay gene'. BBC News.
- Articles by Dr. Daryl Bem will be found at , including several on his EBE theory
- Byne, William (1994). "The Biological Evidence Challenged". Scientific American 270 (5): 50–55. doi:10.1038/scientificamerican0594-50. PMID 8197445.
- Trisha Macnair (undated). Genetics and human behaviour. BBC Health.
- Timothy F. Murphy (Fall 2000). Now What? The Latest Theory of Homosexuality. APA Newsletter on Philosophy and Lesbian, Gay, Bisexual and Transgender Issues.
- Muscarella, F.; Fink, B.; Grammer, K.; Kirk-Smith, M. (2001). "Homosexual Orientation in Males: Evolutionary and Ethological Aspects" (PDF). Neuroendocrinology Letters 22 (6): 393–400. PMID 11781535.
- Nuffield Council on Bioethics (2002). Genetics and human behaviour. London: Author. Chapter 10 discusses sexual orientation.
- Out in Nature: Homosexual Behaviour in the Animal Kingdom, a documentary by Stéphane Alexandresco, Bertrand Loyer and Jessica Menendez
- Rahman Q. (2005). The neurodevelopment of human sexual orientation. Neuroscience and Biobehavioral Reviews 29 :1057–1066.
- Rines JP, vom Saal FS (June 1984). "Fetal effects on sexual behavior and aggression in young and old female mice treated with estrogen and testosterone". Horm Behav 18 (2): 117–29. doi:10.1016/0018-506X(84)90037-0. PMID 6539747.
- Veniegas, Rosemary C.; Conley, Terri D. (2000). "Biological Research on Women's Sexual Orientations: Evaluating the Scientific Evidence". Journal of Social Issues 56 (2): 267–282. doi:10.1111/0022-4537.00165.
- Ryan BC, Vandenbergh JG (October 2002). "Intrauterine position effects". Neurosci Biobehav Rev 26 (6): 665–78. doi:10.1016/S0149-7634(02)00038-6. PMID 12479841.
- LeVay, Simon; Hamer, Dean H. (1994). "Evidence for a Biological Influence in Male Homosexuality". Scientific American 270 (5): 44–49. doi:10.1038/scientificamerican0594-44. PMID 8197444.
- T. J. Taylor (1992). Twin Studies of Homosexuality. Part II Experimental Psychology Dissertation (unpublished), University of Cambridge, UK.
- vom Saal FS (July 1989). "Sexual differentiation in litter-bearing mammals: influence of sex of adjacent fetuses in utero". J. Anim. Sci. 67 (7): 1824–40. PMID 2670873.
- vom Saal FS, Bronson FH (May 1980). "Sexual characteristics of adult female mice are correlated with their blood testosterone levels during prenatal development". Science 208 (4444): 597–9. doi:10.1126/science.7367881. PMID 7367881.
- McCarty, Linda. "Wearing my identity: a transgender teacher in the classroom." Equity & Excellence in Education 36.2 (June 2003): 170–183. Expanded Academic ASAP. Gale. UC Santa Barbara. 10 December 2007 .
- Begley, Sharon. "Nature plus nurture." Newsweek 126.n20 (Nov 13, 1995): 72(1). Expanded Academic ASAP. Gale. UC Santa Barbara. 10 December 2007 .
- Jones, Steve. "Ys and wherefores." New Statesman & Society 6.n256 (June 11, 1993): 30(2). Expanded Academic ASAP. Gale. UC Santa Barbara. 10 December 2007 .
- Dr. Gregory Cochran (July 2005). An Evolutionary Look At Human Homosexuality.
- Caleb Crain (August 1999). Did a Germ Make You Gay?. Out Magazine.
- Molecular Genetic Study of Sexual Orientation A genetic study of gay brothers at Northwestern University.