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This article is about humans who lack sexual attraction or interest in sexual activity. For other uses, see Asexual.
Not to be confused with Agender.

Asexuality (or nonsexuality)[1][2][3] is the lack of sexual attraction to anyone, or low or absent interest in sexual activity.[4][5][6] It may be considered the lack of a sexual orientation, or one of the four variations thereof, alongside heterosexuality, homosexuality, and bisexuality.[7][8][9] A study in 2004 placed the prevalence of asexuality at 1% in the British population.[7][10]

Asexuality is distinct from abstention from sexual activity and from celibacy,[11][12] which are behavioral and generally motivated by factors such as an individual's personal or religious beliefs.[13] Sexual orientation, unlike sexual behavior, is believed to be "enduring."[14] Some asexual people engage in sexual activity despite lacking a desire for sex or sexual attraction, due to a variety of reasons, such as a desire to pleasure themselves or romantic partners, or a desire to have children.[6][11]

Acceptance of asexuality as a sexual orientation and field of scientific research is still relatively new,[4][6][8][15] as a growing body of research from both sociological and psychological perspectives has begun to develop.[6] While some researchers assert that asexuality is a sexual orientation, other researchers disagree.[8][9]

Various asexual communities have started to form since the advent of the World Wide Web and social media. The most prolific and well-known of these communities is the Asexual Visibility and Education Network (AVEN), which was founded in 2001 by David Jay.[9][16]


Identity and relationships[edit]

Because there is significant variation among people who identify as asexual, asexuality can encompass broad definitions.[17] Researchers generally define asexuality as the lack of sexual attraction or the lack of sexual interest,[4][6][9] but their definitions vary; they may use the term "to refer to individuals with low or absent sexual desire or attractions, low or absent sexual behaviors, exclusively romantic non-sexual partnerships, or a combination of both absent sexual desires and behaviors."[6]

The Asexual Visibility and Education Network (AVEN) defines an asexual as "someone who does not experience sexual attraction" and stated, "[a]nother small minority will think of themselves as asexual for a brief period of time while exploring and questioning their own sexuality" and that "[t]here is no litmus test to determine if someone is asexual. Asexuality is like any other identity – at its core, it's just a word that people use to help figure themselves out. If at any point someone finds the word asexual useful to describe themselves, we encourage them to use it for as long as it makes sense to do so."[15]

Asexual people, though lacking sexual attraction to any gender, might engage in purely romantic relationships, while others might not.[9][18][19] There are asexual-identified individuals who report that they feel sexual attraction but not the inclination to act on it because they have no true desire or need to engage in sexual or non-sexual activity (cuddling, hand-holding, etc.), while other asexuals engage in cuddling or other non-sexual physical activity.[6][11][12][17] Some asexuals participate in sexual activity out of curiosity.[6] Some may masturbate as a solitary form of release, while others do not feel a need to do so.[17][20][21]

With regard to sexual activity in particular, the need or desire for masturbation is commonly referred to as sex drive by asexuals and they disassociate it from sexual attraction and being sexual; asexuals who masturbate generally consider it to be a normal product of the human body and not a sign of latent sexuality, and may not even find it pleasurable.[6] Some asexual men are unable to get an erection and sexual activity by attempting penetration is impossible for them.[22] Asexuals also differ in their feelings toward performing sex acts: some are indifferent and may have sex for the benefit of a romantic partner; others are more strongly averse to the idea, though they do not typically dislike people for having sex.[6][17][21]

Concerning romantic or emotional aspects of sexual orientation or sexual identity, asexuals may identify as heterosexual, lesbian, gay, bisexual, queer,[15][18] or by the following terms to indicate that they associate with the romantic, rather than sexual, aspects of sexual orientation:[17][18]

  • aromantic; lack of romantic attraction towards anyone
  • biromantic; as opposed to bisexual
  • heteroromantic; as opposed to heterosexual
  • homoromantic; as opposed to homosexual
  • panromantic; as opposed to pansexual

People may also identify as a gray-A, gray-romantic, demiromantic, demisexual or semisexual because they feel that they are between being aromantic and non-aromantic, or between asexuality and sexual attraction. While the term gray-A may cover anyone who occasionally feels romantic or sexual attraction, demisexuals or semisexuals experience sexual attraction only as a secondary component, feeling sexual attraction once a reasonably stable or large emotional connection has been created.[17][23]

Sexual orientation and etiology[edit]

There is significant debate over whether or not asexuality is a sexual orientation.[8][9] It has been compared and equated with hypoactive sexual desire disorder (HSDD), in that both imply a general lack of sexual attraction to anyone; HSDD has been used to medicalize asexuality, but asexuality is generally not considered a disorder or a sexual dysfunction (such as anorgasmia, anhedonia, etc.), because asexuality does not necessarily define someone as having a medical problem or problems relating to others socially.[12][18][24] Unlike people with HSDD, asexual people normally do not experience "marked distress" and "interpersonal difficulty" concerning feelings about their sexuality, or generally a lack of sexual arousal; asexuality is considered the lack or absence of sexual attraction as a life-enduring characteristic.[4][18] One study found that, compared to HSDD subjects, asexuals reported lower levels of sexual desire, sexual experience, sex-related distress and depressive symptoms.[25] Researchers Richards and Barker report that asexuals do not have disproportionate rates of alexithymia, depression, or personality disorders. [18] Some people may identify as asexual, however, even if their non-sexual state is explained by one or more of the aforementioned disorders.[26]

Asexuality may be argued as not being a meaningful category to add to the continuum of sexual orientations, and instead argued as the lack of a sexual orientation or sexuality.[8] Other arguments propose that asexuality is the denial of one's natural sexuality, and that it is a disorder caused by shame of sexuality, anxiety or sexual abuse, sometimes basing this belief on asexuals who masturbate or occasionally engage in sexual activity simply to please a romantic partner.[8][21][22]

The suggestion that asexuality is a sexual dysfunction is controversial among the asexual community. Those who identify as asexual usually prefer it to be recognized as a sexual orientation.[9][27] Various scholars state that asexuality is a sexual orientation, as some asexuals are unable to masturbate even though they reportedly have a normal sex drive, and that there are variations of sexual preferences, arguing that asexuality ought to be included as well.[8][11][22] They state that asexuals do not choose to have no sexual desire, and generally start to find out their differences in sexual behaviors around adolescence. Because of these facts coming to light, it is argued that asexuality is much more than a behavioral choice, and is not something that can be cured like a disorder.[22][28]

Etiology in this context is without implication of disease, disorder, or abnormality.[29][30][31][32] Research on the etiology of sexual orientation when applied to asexuality has the definitional problem of sexual orientation not consistently being defined by researchers as including asexuality.[33] Sexual orientation is defined as "enduring" and resistant to change, proving to be generally impervious to interventions intended to change it.[14] While heterosexuality, homosexuality and bisexuality are usually, but not always, determined during the early years of preadolescent life, it is not known when asexuality is determined. "It is unclear whether these characteristics [viz., "lacking interest in or desire for sex"] are thought to be lifelong, or if they may be acquired."[6]

Non-measurement in some areas of sexual orientation is accepted by the American Psychological Association, the American Psychiatric Association, and the National Association of Social Workers: "[S]imply to document that a phenomenon occurs, case studies and non-probability samples are often adequate ... Some groups are sufficiently few in number – relative to the entire population – that locating them with probability sampling is extremely expensive or practically impossible. In the latter cases, the use of non-probability samples is often appropriate."[34] In determining etiologies, when asexuals are a small percentage of a large society, asexuals with a given etiology will compose an even smaller percentage, so that etiological information is available only from some individuals, generally not randomly selected.[35]



Asexuality is not a new aspect of human sexuality, but it is relatively new to public discourse.[36] SE Smith of The Guardian is not sure asexuality has actually increased, rather leaning towards the belief that it is simply more visible.[36] In the mid-twentieth century, Alfred Kinsey rated individuals from 0 to 6 according to their sexual orientation from heterosexual to homosexual, known as the Kinsey scale. He also included a category he called "X" for individuals with "no socio-sexual contacts or reactions";[37][38] in modern times, this is categorized as representing asexuality.[39] Kinsey labeled 1.5% of the adult male population as X.[37][38] In his second book, Sexual Behavior in the Human Female, he reported this breakdown of individuals who are X: unmarried females = 14–19%, married females = 1–3%, previously married females = 5–8%, unmarried males = 3–4%, married males = 0%, and previously married males = 1–2%.[38]

Further empirical data about an asexual demographic appeared in 1994, when a research team in the United Kingdom carried out a comprehensive survey of 18,876 British residents, spurred by the need for sexual information in the wake of the AIDS pandemic. The survey included a question on sexual attraction, to which 1.05% of the respondents replied that they had "never felt sexually attracted to anyone at all".[40] The study of this phenomenon was continued by the Canadian sexuality researcher Anthony Bogaert in 2004, who explored the asexual demographic in a series of studies. Bogaert believed that the 1% figure was not an accurate reflection of the likely much larger percentage of the population that could be identified as asexual, noting that 30% of people contacted for the initial survey chose not to participate in the survey. Since less sexually experienced people are more likely to refuse to participate in studies about sexuality, and asexuals tend to be less sexually experienced than sexuals, it is likely that asexuals were under-represented in the responding participants. The same study found the number of homosexuals and bisexuals combined to be about 1.1% of the population, which is much smaller than other studies indicate.[4][7]

Sexual activity and sexuality[edit]

While some asexuals masturbate as a solitary form of release or have sex for the benefit of a romantic partner, others do not (see above).[6][17][20] The Kinsey Institute sponsored another small survey on the topic in 2007, which found that self-identified asexuals "reported significantly less desire for sex with a partner, lower sexual arousability, and lower sexual excitation but did not differ consistently from non-asexuals in their sexual inhibition scores or their desire to masturbate".[6]

A 1977 paper titled Asexual and Autoerotic Women: Two Invisible Groups, by Myra T. Johnson, may be the first paper explicitly devoted to asexuality in humans. Johnson defines asexuals as those men and women "who, regardless of physical or emotional condition, actual sexual history, and marital status or ideological orientation, seem to prefer not to engage in sexual activity." She contrasts autoerotic women with asexual women: "The asexual woman ... has no sexual desires at all [but] the autoerotic woman ... recognizes such desires but prefers to satisfy them alone." Johnson's evidence is mostly letters to the editor found in women's magazines written by asexual/autoerotic women. She portrays them as invisible, "oppressed by a consensus that they are nonexistent," and left behind by both the sexual revolution and the feminist movement. Society either ignores or denies their existence or insists they must be ascetic for religious reasons, neurotic, or asexual for political reasons.[41]

In a study published in 1979 in Advances in the Study of Affect, vol. 5, and in another article using the same data and published in 1980 in the Journal of Personality and Social Psychology, Michael D. Storms of the University of Kansas outlined his own reimagining of the Kinsey scale. Whereas Kinsey measured sexual orientation based on a combination of actual sexual behavior and fantasizing and eroticism, Storms only used fantasizing and eroticism. Storms, however, placed hetero-eroticism and homo-eroticism on separate axes rather than at two ends of a single scale; this allows for a distinction between bisexuality (exhibiting both hetero- and homo-eroticism in degrees comparable to hetero- or homosexuals, respectively) and asexuality (exhibiting a level of homo-eroticism comparable to a heterosexual and a level of hetero-eroticism comparable to a homosexual, namely, little to none). Storms conjectured that many researchers following Kinsey's model could be mis-categorizing asexual subjects as bisexual, because both were simply defined by a lack of preference for gender in sexual partners.[42][43]

The first study that gave empirical data about asexuals was published in 1983 by Paula Nurius, concerning the relationship between sexual orientation and mental health. Unlike previous studies on the subject, she used the above-mentioned two-dimensional model for sexual orientation. Six hundred eighty-nine subjects—most of whom were students at various universities in the United States taking psychology or sociology classes—were given several surveys, including four clinical well-being scales and a survey asking how frequently they engaged in various sexual activities and how often they would like to engage in those activities. Based on the results, respondents were given a score ranging from 0 to 100 for hetero-eroticism and from 0 to 100 for homo-eroticism. Respondents who scored lower than 10 on both were labeled "asexual." This consisted of 5% of the males and 10% of the females. Results showed that asexuals were more likely to have low self-esteem and more likely to be depressed than members of other sexual orientations; 25.88% of heterosexuals, 26.54% bisexuals (called "ambisexuals"), 29.88% of homosexuals, and 33.57% of asexuals were reported to have problems with self-esteem. A similar trend existed for depression. Nurius did not believe that firm conclusions can be drawn from this for a variety of reasons. Asexuals also reported much lower frequency and desired frequency of a variety of sexual activities including having multiple partners, anal sexual activities, having sexual encounters in a variety of locations, and autoerotic activities.[44]

Though comparisons with non-human sexuality are problematic, a series of studies done on ram mating preferences at the United States Sheep Experiment Station in Dubois, Idaho, starting in 2001 found that about 2–3% of the animals being studied had no apparent interest in mating with either sex; the researchers classified these animals as asexual, but found them to be otherwise healthy with no recorded differences in hormone levels.[45][46]

A paper written by Karli June Cerankowski and Megan Milks, titled New Orientations: Asexuality and Its Implications for Theory and Practice, suggests that asexuality may be somewhat of a question in itself for the studies of gender and sexuality.[47] Cerankowski and Milks have found that asexuality, by means of feminist and queer studies, raises many more questions than it resolves, such as how a person could abstain from having sex which is generally accepted by society to be the most basic of instincts. The article also states that society has either deemed "[LGBT and] female sexuality as empowered or repressed. The asexual movement challenges that assumption by challenging many of the basic tenets of pro-sex feminism already defined as repressive or anti-sex sexualities." Asexual Visibility and Education Network (AVEN) has formulated asexuality as a biologically determined orientation. This formula, if dissected scientifically and proven, would support researcher Simon LeVay's blind study of the hypothalamus in gay men, women, and straight men, which found that there is a biological difference between straight men and gay men.[48]


A commonly used asexual pride flag

A community of self-identified asexuals coalesced in the early 21st century, aided by the popularity of online communities.[20] Elizabeth Abbott, author of A History of Celibacy, acknowledges a difference between asexuality and celibacy, and posits that there has always been an asexual element in the population but that asexual people kept a low profile. While the failure to consummate marriage was seen as "an insult to the sacrament of marriage" in medieval Europe, and has sometimes been used as grounds for divorce or to rule a marriage void, asexuality, unlike homosexuality, has never been illegal, and asexual people have usually been able to "fly under the radar". However, in the 21st century, the anonymity of online communication and general popularity of social networking online has facilitated the formation of a community built around a common asexual identity.[49]

The AVEN triangle representing asexuality. The top line of the triangle represents the Kinsey scale with the third point representing the other dimension of sexual attraction; the grey area depicting the gradient between sexual and asexual.[50]

The Asexual Visibility and Education Network (AVEN) is an organization founded by American asexuality activist David Jay in 2001 that focuses on asexuality issues.[9][16][51] Its stated goals are "creating public acceptance and discussion of asexuality and facilitating the growth of an asexual community".[51] Communities such as AVEN can be beneficial to those in search of answers to solve a crisis of identity with regard to their possible asexuality. Individuals go through a series of emotional processes that end with their identifying with the asexual community. They first realize that their sexual attractions differ from those of most of society. This difference leads to questioning whether the way they feel is acceptable, and possible reasons for why they feel this way. Pathological beliefs tend to follow where, in some cases, they may seek medical help because they feel they have a disease. Self-understanding is usually reached when they find a definition that matches their feelings. Asexuality communities provide support and information that allows newly identified asexuals to move from self-clarification to identifying on a communal level, which can be empowering, because they now have something to associate with, which gives normality to this overall socially-isolating situation.[52]

At this time, asexual organizations and other Internet resources play a key role in informing people about asexuality. The lack of research makes it difficult for doctors to understand the causation. Most people who say they are asexual are self-identified. This can be a problem when asexuality is mistaken for an intimacy or relationship problem or for other symptoms that do not define asexuality. There is also a significant population that either does not understand or does not believe in asexuality, which adds to the importance of these organizations to inform the general population; however, due to the lack of scientific fact on the subject, what these groups promote as information is often questioned.

In 2009, AVEN members participated in the first asexual entry into an American pride parade when they walked in the San Francisco Pride Parade.[53] In August 2010, after a period of debate over having an asexual flag and how to set up a system to create one, and contacting as many asexual communities as possible, a flag was announced as the asexual pride flag by one of the teams involved. The final flag had been a popular candidate and had previously seen use in online forums outside of AVEN. The final vote was held on a survey system outside of AVEN where the main flag creation efforts were organized. The flag colors have been used in artwork and referenced in articles about the sexuality.[54]

On June 29, 2014, AVEN organised the second International Asexuality Conference, as an affiliate WorldPride event in Toronto. The event, which was attended by around 250 people, was the largest gathering of asexuals to date.[55] The conference included presentations, discussions, and workshops on topics such as research on asexuality, asexual relationships, and intersecting identities.

Discrimination and legal protections[edit]

Asexuals marching

A 2012 study published in Group Processes & Intergroup Relations reports there is more prejudice, dehumanization and discrimination toward asexuals than toward other sexual minorities, such as gay men, lesbians and bisexuals. Both homosexual and heterosexual people thought of asexuals as not only cold, but also animalistic and unrestrained. The same study also found more bias towards sapiosexuals (people who find intelligence the most sexually attractive feature) than towards homosexuals or bisexuals, and that attitudes towards sapiosexuals was the strongest correlate of attitudes towards asexuals.[56] Asexual activist, author, and blogger Julie Decker has observed that sexual harassment and violence, such as corrective rape, commonly victimizes the asexual community.[57] However, a different study found little evidence of serious discrimination against asexuals because of their asexuality.[58] Sociologist Mark Karrigan sees a middle ground, claiming that while asexuals do often experience discrimination, it is not of a phobic nature but "more about marginalization because people genuinely don't understand asexuality."[59]

Asexuals also face prejudice from within the LGBT community. Upon coming out as asexual, activist Sara Beth Brooks was told by many LGBT people that asexuals are mistaken in their self-identification and seek undeserved attention within the social justice movement.[57]

In some jurisdictions, asexuals have legal protections. While Brazil bans since 1999 whatever pathologization or attempted treatment of sexual orientation by mental health professionals through the national ethical code,[60][61] the U.S. state of New York has labeled asexuals as a protected class.[62] However, asexuality does not typically attract the attention of the public or major scrutiny; therefore, it has not been the subject of legislation as much as other sexual orientations have.[7]

See also[edit]


  1. ^ "Asexual". Retrieved 3 December 2011. 
  2. ^ "Nonsexual". Retrieved 3 December 2011. 
  3. ^ Harris, Lynn (26 May 2005). "Asexual and proud!". Salon. Retrieved 3 December 2011. 
  4. ^ a b c d e Bogaert, Anthony F. (2006). "Toward a conceptual understanding of asexuality". Review of General Psychology 10 (3) 241–250. Retrieved 31 August 2007.
  5. ^ Kelly, Gary F. (2004). "Chapter 12". Sexuality Today: The Human Perspective (7 ed.). McGraw-Hill. p. 401. ISBN 978-0-07-255835-7  Asexuality is a condition characterized by a low interest in sex. 
  6. ^ a b c d e f g h i j k l m Prause, Nicole; Cynthia A. Graham (August 2004). "Asexuality: Classification and Characterization" (PDF). Archives of Sexual Behavior 36 (3): 341–356. doi:10.1007/s10508-006-9142-3. PMID 17345167. Archived from the original on 27 September 2007. Retrieved 31 August 2007. 
  7. ^ a b c d Bogaert, Anthony F. (2004). "Asexuality: prevalence and associated factors in a national probability sample". Journal of Sex Research 41 (3): 279–87. doi:10.1080/00224490409552235. PMID 15497056. 
  8. ^ a b c d e f g Melby, Todd (November 2005). "Asexuality gets more attention, but is it a sexual orientation?". Contemporary Sexuality 39 (11): 1, 4–5. ISSN 1094-5725. Retrieved 20 November 2011  The journal currently does not have a website 
  9. ^ a b c d e f g h Marshall Cavendish, ed. (2010). "Asexuality". Sex and Society 2. Marshall Cavendish. pp. 82–83. ISBN 978-0-7614-7906-2. Retrieved 27 July 2013. 
  10. ^ "Study: One in 100 adults asexual". CNN. 15 October 2004. Archived from the original on 27 October 2007. Retrieved 11 November 2007. 
  11. ^ a b c d Margaret Jordan Halter, Elizabeth M. Varcarolis (2013). Varcarolis' Foundations of Psychiatric Mental Health Nursing. Elsevier Health Sciences. p. 382. ISBN 1-4557-5358-0. Retrieved May 7, 2014. 
  12. ^ a b c DePaulo, Bella (26 September 2011). "ASEXUALS: Who Are They and Why Are They Important?". Psychology Today. Retrieved 13 December 2011. 
  13. ^ The American Heritage Dictionary of the English Language (3d ed. 1992), entries for celibacy and thence abstinence
  14. ^ a b "Sexual orientation, homosexuality and bisexuality". American Psychological Association. Retrieved March 30, 2013. 
  15. ^ a b c "Overview". The Asexual Visibility and Education Network (AVEN). 2008. Retrieved 14 October 2011. 
  16. ^ a b Swash, Rosie (February 25, 2012). "Among the asexuals". The Guardian. Retrieved February 2, 2013. 
  17. ^ a b c d e f g Karli June Cerankowski, Megan Milks (2014). Asexualities: Feminist and Queer Perspectives. Routledge. pp. 89–93. ISBN 1-134-69253-6. Retrieved July 3, 2014. 
  18. ^ a b c d e f Christina Richards, Meg Barker (2013). Sexuality and Gender for Mental Health Professionals: A Practical Guide. SAGE. pp. 124–127. ISBN 1-4462-9313-0. Retrieved July 3, 2014. 
  19. ^ Relationship FAQ The Asexual Visibility and Education Network (AVEN), 2008. Retrieved 22 December 2011.
  20. ^ a b c Westphal, Sylvia Pagan (2004). "Feature: Glad to be asexual". New Scientist. Archived from the original on 19 December 2007. Retrieved 11 November 2007. 
  21. ^ a b c Bridgeman, Shelley (5 August 2007). "No sex please, we're asexual". The New Zealand Herald. Retrieved 16 September 2011. 
  22. ^ a b c d Carrigan, Mark (August 2011). "There's More to Life Than Just Sex? Difference and Commonality Within the Asexual Community". Sexualities 14 (4): 462–478. doi:10.1177/1363460711406462. 
  23. ^ Adler, Melissa (2010). "Meeting the Needs of LGBTIQ Library Users and Their Librarians: A Study of User Satisfaction and LGBTIQ Collection Development in Academic Libraries". In Greenblatt, Ellen. Serving LGBTIQ Library and Archives Users. North Carolina: McFarland & Company. ISBN 978-0-7864-4894-4. 
  24. ^ Chasin, CJ DeLuzio (2013). "Reconsidering Asexuality and Its Radical Potential". Feminist Studies 39 (2): 405. Retrieved April 29, 2014. 
  25. ^ Brotto, L. A., Yule, M. A., & Gorzalka, B. B. (2015). "Asexuality: An Extreme Variant of Sexual Desire Disorder?". The Journal of Sexual Medicine. 
  26. ^ Karli June Cerankowski, Megan Milks (2014). Asexualities: Feminist and Queer Perspectives. Routledge. p. 246. ISBN 1-134-69253-6. Retrieved July 3, 2014. 
  27. ^ Yule, Morag; Lori A. Brotto; Boris B. Gorzalka (2014). "Biological Markers of Asexuality: Handedness, Birth Order, and Finger Length Ratios in Self-identified Asexual Men and Women". Archives of Sexual Behavior 43 (2): 299. doi:10.1007/s10508-013-0175-0. Retrieved 29 April 2014. 
  28. ^ Over, Ray; Koukounas, Eric (1995). "Habituation of Sexual Arousal: Product and Process". Annual Review of sex Research 6 (1): 187–223. doi:10.1080/10532528.1995.10559905  See here 
    Cited from: Kelly, Gary F. (2004). Sexuality Today: The Human Perspective (7 ed.). McGraw-Hill. p. 401. ISBN 978-0-07-255835-7. 
  29. ^ In Webster's Third (Merriam-Webster), etiology is defined both with and without reference to disease. The word is defined as "a science or doctrine of causation or of the demonstration of causes" and as "a branch of science dealing with the causes of particular phenomena", thus without implying disease or abnormality. However, it is also defined as "all the factors that contribute to the occurrence of a disease or abnormal condition". Webster's Third New International Dictionary of the English Language Unabridged ([prob. Springfield, Mass.:] G. & C. Merriam (Merriam-Webster), 1966), entry etiology.
  30. ^ In the Shorter Oxford Eng. Dict. ([4th] ed.), etiology is defined both with and without reference to disease. The word is defined as "[t]he assignment of a cause", as "the cause assigned", and, as now rare or obsolete, as "[t]he philosophy of causation; the part of a science which treats of the causes of its phenomena". However, it is also defined in medicine as "[t]he causation of disease (usu., of a specified disease), esp. as a subject for investigation". The New Shorter Oxford English Dictionary: On Historical Principles (Oxford: Clarendon Press, [4th] ed. 1993 (ISBN 0-19-861271-0)), entry aetiology, via entry etiology.
  31. ^ In the American Heritage Dict. (3d ed.), etiology is defined both with and without reference to disease. The word is defined as "[t]he study of causes or origins" and as "[a]ssignment of a cause, an origin, or a reason for something". However, it is also defined as "[t]he branch of medicine that deals with the causes or origins of disease" and as "[t]he cause or origin of a disease or disorder as determined by medical diagnosis". The American Heritage Dictionary of the English Language (Boston, Mass.: Houghton Mifflin, 3d ed. 1992 (ISBN 0-395-44895-6)), entry etiology.
  32. ^ In a nursing dictionary, etiology is defined relative only to disease. The word is defined as "[t]he study of the causes of disease" and as "[t]he cause of a disease", with no other definitions, in Thomas, Clayton L., ed., Taber's Cyclopedic Medical Dictionary (Philadelphia: F. A. Davis, ed. 16 8th printing 1989 (ISBN 0-8036-8310-3)), entry etiology. The dictionary is intended for "those in the field of nursing" and others. Id., p. viii (Introduction to Edition 16, by Clayton Lay Thomas).
  33. ^ E.g., one study on hormonal influences defines sexual orientation as "heterosexuality, homosexuality, or bisexuality" only. Cited in: Garcia-Falgueras, Alicia, & Swaab, Dick F. (2010). "Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation". Endocrine Development. 17:24. PMID 19955753. (Article found in Sandro Loche, Marco Cappa, Lucia Ghizzoni, Mohamad Maghnie, & Martin O. Savage, eds. Vol.17 Pediatric Neuroendocrinology) ("sexual orientation (heterosexuality, homosexuality, or bisexuality)"). ISSN 1421-7082.
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  45. ^ Roselli, Charles A.; Stormshak, F; Stellflug, JN; Resko, JA (2002). "Relationship of serum testosterone concentrations to mate preferences in rams". Biology of Reproduction 67 (1): 263–268. doi:10.1095/biolreprod67.1.263. PMID 12080026. Retrieved 31 August 2007. 
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Further reading[edit]

External links[edit]

External video
A fictional film about asexuality at Amazon Studios
Antisex: No Sex and the City