Demographics of sexual orientation
||This article may contain original research. (October 2010)|
The demographics of sexual orientation are difficult to establish for a variety of reasons. One of the major reasons for the difference in statistical findings regarding homosexuality and bisexuality has to do with the nature of the research questions. Major research studies on sexual orientation are discussed. Most of the studies listed below rely on self-report data, which poses challenges to researchers inquiring into sensitive subject matter. More importantly, the studies tend to pose two different sets of questions. One set examines self-report data of same-sex sexual experiences and attractions while the other set examines self-report data of personal identification as gay, lesbian, or bisexual. Fewer research subjects identify as gay, lesbian, or bisexual than report having sexual experiences or attraction to a person of the same sex. Several studies of sexual orientation in various countries provide comparative perspectives. Tables comparing several U.S. cities' population numbers are also included.
Homophobic settings may also mean that some LGBT people may not openly identify as such, and open identification of one's true sexual orientation may depend on the status of LGBT rights in a given location.
Incidence versus prevalence 
Another significant distinction can be made between what medical statisticians call incidence and prevalence. For example, even if two studies agree on a common criterion for defining a sexual orientation, one study might regard this as applying to any person who has ever met this criterion, whereas another might only regard them as being so if they had done so during the year of the survey. However, it must also be understood that sexual orientation refers to an enduring pattern of emotional, romantic, and/or sexual attractions to men, women, or both sexes. Sexual orientation also refers to a person’s sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions. Therefore, a person can be celibate and still identify as being bisexual or homosexual based on romantic proclivities.
Western perception of homosexuality versus the rest of the world 
The population that has come to be referred to as "gay" in the West is not a descriptive term that would be recognized by all men who have sex with men (MSM) as known in the rest of the world. While gay culture is increasingly open and discussed, the world of MSM consists of a diverse population that often may respond differently depending on how communications in clinical settings are framed."Gay" is generally used to describe a sexual orientation, while "MSM" describes a behavior.
Some men who have sex with other men will not relate to the term "gay" or homosexual, and do not regard sex with other men as sexual activity, a term they reserve for sexual relations with women. This is particularly true among individuals from non-Western cultures. Nevertheless, it is also common in the US. Terms such as MSM or “same gender loving” are often used in place of the word gay. Men in Africa & Latin America, engage in sexual relationships with other men while still referring to themselves as 'heterosexual', which is known as being on the "down-low". The same is true of men who engage in homosexual activities in the military, gender segregated schools and universities, or prison; most of them do not consider themselves as gay but still engage sexually with members of their own sex in order to fulfill their sexual desires.
There is a lack of information on sexual behaviour in most developing countries. The limited sources that are available indicate that although homosexual self-identification might occur relatively infrequently, the prevalence of homosexual behaviour is higher. These men are not taken into consideration in some sexual identity surveys which may lead to underreporting and inaccurate surveys.
Importance of having reliable demographics 
Reliable data as to the size of the gay and lesbian population would be valuable for informing public policy. For example, demographics would help in calculating the costs and benefits of domestic partnership benefits, of the impact of legalizing gay adoption, and of the impact of the US military's Don't ask, don't tell policy. Further, knowledge of the size of the "gay and lesbian population holds promise for helping social scientists understand a wide array of important questions—questions about the general nature of labor market choices, accumulation of human capital, specialization within households, discrimination, and decisions about geographic location."
The Kinsey Reports 
Two of the most famous studies of the demographics of human sexual orientation were Dr. Alfred Kinsey's Sexual Behavior in the Human Male (1948) and Sexual Behavior in the Human Female (1953). These studies used a seven-point spectrum to define sexual behavior, from 0 for completely heterosexual to 6 for completely homosexual. Kinsey concluded that a small percentage of the population were to one degree or another bisexual (falling on the scale from 1 to 5). He also reported that 37% of men in the U.S. had achieved orgasm through contact with another male after adolescence and 13% of women had achieved orgasm through contact with another woman.
His results, however, have been disputed, especially in 1954 by a team consisting of John Tukey, Frederick Mosteller and William G. Cochran, who stated much of Kinsey's work was based on convenience samples rather than random samples, and thus would have been vulnerable to bias.
Paul Gebhard, Kinsey's successor as director of the Kinsey Institute for Sex Research, dedicated years to reviewing the Kinsey data and culling its purported contaminants. In 1979, Gebhard (with Alan B. Johnson) concluded that none of Kinsey's original estimates were significantly affected by the perceived bias, finding that 36.4% of men had engaged in both heterosexual and homosexual activities, as opposed to Kinsey's 37%.
Modern survey results 
Since most of the surveys mentioned are based on door to door or telephone based statistics, the numbers and percentages mentioned are strongly likely to be under reported since most LGBT people still live in fear of being outed by their local authorities and mostly their family members, therefore choose to hide their real sexual identity.
Recent critiques of these studies have suggested that because of their dependence on self identification, they may have under counted the true prevalence of men with a history of same sex behavior and/or desire.
The largest and most thorough survey in Australia to date was conducted by telephone interview with 19,307 respondents between the ages of 16 and 59 in 2001/2002. The study found that 97.4% of men identified as heterosexual, 1.6% as gay and 0.9% as bisexual. For women 97.7% identified as heterosexual, 0.8% as lesbian and 1.4% as bisexual. Nevertheless, 8.6% of men and 15.1% of women reported either feelings of attraction to the same gender or some sexual experience with the same gender. Half the men and two thirds of the women who had same-sex sexual experience regarded themselves as heterosexual rather than homosexual.
A study of 5,514 college and university students under the age of 25 found 1% who were homosexual and 1% who were bisexual.
A random survey found that 2.7% of the 1,373 men who responded to their questionnaire had homosexual experience (intercourse).
A study of 20,055 people found that 4.1% of the men and 2.6% of the women had at least one occurrence of intercourse with person of the same sex during their lifetime.
A study of the responses of 7,441 individuals, conducted by the ESRI, found that 2.7% of men and 1.2% of women self-identified as homosexual or bisexual. A question based on a variant of the Kinsey scale found that 5.3% of men and 5.8% of women reported some same-sex attraction. Of those surveyed, 7.1% of men and 4.7% of women reported a homosexual experience some time in their life so far. It also found that 4.4% of men and 1.4% of women reported a "genital same-sex experience" (oral or anal sex, or any other genital contact) in their life so far. The study was commissioned and published by the Crisis Pregnancy Agency in partnership with the Department of Health and Children.
New Zealand 
In an anonymous survey of 8,000 New Zealand secondary school students conducted by the University of Auckland, 0.9% of those surveyed reported exclusive attraction to the same sex, 3.3% to both sexes and 1.8% to neither. 
In a random survey of 6,300 Norwegians, 3.5% of the men and 3% of the women reported that they had a homosexual experience sometime in their life.
According to Durex Global Sex Survey for 2003, 12% of Norwegian respondents have had homosexual sex.
United Kingdom 
A study of 8,337 British men found that 6.1% have had a "homosexual experience" and 3.6% had "1+ homosexual partner ever."
HM Treasury and the Department of Trade and Industry completed a survey to help the Government analyse the financial implications of the Civil Partnerships Act (such as pensions, inheritance and tax benefits). They concluded that there were 3.6 m gay people in Britain—around 6% of the total population or 1 in 16.66 people.
A representative survey of 238,206 Britons, exclusive to their categories, found 1% identified as gay or lesbian and 0.5% said they were bisexual. A further 0.5% self-identified as "other", and 3% responded as "do not know" or refused to answer. In total this adds up to 5% of people who do not identify as heterosexual. Ben Summerskill, Chief Executive of the gay equality charity Stonewall stated: "This is the first time that people were asked and data collection happened on doorsteps or over the phone, which may deter people from giving accurate responses - particularly if someone isn't openly gay at home." Stonewall worked with 600 major employers and their experience had shown that these statistics increased when people were regularly asked about sexual orientation as part of general monitoring information. It was therefore suggested that much of the 3% who answered as other may simply be homosexual or bisexual and a percentage of people may have lied when they claimed to be heterosexual.
The UK Census gives the following figures
• 1.1 per cent of the surveyed UK population, approximately 545,000 adults, identified themselves as Gay or Lesbian,
• 0.4 per cent of the surveyed UK population, approximately 220,000 adults, identified themselves as Bisexual,
• 0.3 per cent identified themselves as ‘Other’,
• 3.6 per cent of adults stated ‘Don’t know’ or refused to answer the question,
• 0.6 per cent of respondents provided ‘No response’ to the question.
• 2.7 per cent of 16 to 24 year olds in the UK identified themselves as Gay, Lesbian or Bisexual compared with 0.4 per cent of 65 year olds and over,
United States 
Ratios of proportions 
In general, most research agrees that the number of people who have had multiple same-gender sexual experiences is fewer than the number of people who have had a single such experience, and that the number of people who identify themselves as exclusively homosexual is fewer than the number of people who have had multiple homosexual experiences.[original research?]
Change over time 
In addition, major historical shifts can occur in reports of the prevalence of homosexuality. For example, the Hamburg Institute for Sexual Research conducted a survey over the sexual behavior of young people in 1970, and repeated it in 1990. Whereas in 1970 18% of the boys aged 16 and 17 reported to have had at least one same-sex sexual experience, the number had dropped to 2% by 1990. "Ever since homosexuality became publicly argued to be an innate sexual orientation, boys' fear of being seen as gay has, if anything, increased", the director of the institute, Volkmar Sigusch, suggested in a 1998 article for a German medical journal.
Top cities 
In 2009, in a survey conducted by University of São Paulo in 10 capitals of Brazil, of the men 7.8% were gay and 2.6% were bisexual, for a total of 10.4%, and of the women 4.9% were lesbian and 1.4% were bisexual, for a total of 6.3%.
|1||Rio de Janeiro||14.30%||1|
United States 
These charts show a list of the top 10 US metropolitan areas with the highest LGB population in terms of numbers of total gay, lesbian and bisexual residents, based on estimates published in 2006 by the Williams Institute of the UCLA School of Law.
Top Ranked by Percent:
Top Ranked by Total Population:
|1||New York City||6%||272,493||1|
|1||New York City – Northern New Jersey – Long Island, NY||568,903||2.6%|
|2||Los Angeles – Long Beach, CA – Santa Ana, CA||442,211||2.7%|
|4||San Francisco – Oakland – Fremont, CA||256,313||3.6%|
|5||Boston – Cambridge, MA – Quincy, MA||201,344||3.4%|
|7||Dallas – Fort Worth – Arlington, TX||183,718||3.5%|
|8||Miami – Miami Beach – Fort Lauderdale||183,346||4.7%|
|9||Atlanta – Marietta, GA – Sandy Springs, GA||180,168||4.3%|
|10||Philadelphia – Camden, NJ – Wilmington, DE||179,459||2.8%|
See also 
- American Psychological Association. "Sexual Orientation and Homosexuality". Psychology Help Center. Retrieved 9 December 2011.
- http://www.rutgerswpf.org/sites/default/files/Sexual%20Orientation.pdf Sexual Orientation and Young People
- Dan Black, Gary Gates, Seth Sanders, Lowell Taylor (2000). "Demographics of the Gay and Lesbian Population in the United States: Evidence from Available Systematic Data Sources". Demography 37 (2): 139–154. doi:10.2307/2648117. JSTOR 2648117. PMID 10836173.
- The Kinsey Institute Data from Alfred Kinsey's Studies. Published online.
- Cochran, W. G., Mosteller, F. and Tukey, J. W. (1954). Statistical Problems of the Kinsey Report on Sexual Behavior in the Human Male. Amer. Statist. Assoc., Washington.
- Sex in Australia: The Australian study of health and relationships, Australian Research Centre in Sex, Health and Society. (Published as the Australian and New Zealand Journal of Public Health vol 27 no 2.)
- King et al. (1988). Canada, Youth and AIDS Study. Kingston, ON: Queen's University.
- Melbye M, Biggar RJ (March 1992). "Interactions between persons at risk for AIDS and the general population in Denmark". Am. J. Epidemiol. 135 (6): 593–602. PMID 1580235.
- "AIDS and sexual behavior in France. ACSF investigators". Nature 360 (6403): 407–9. December 1992. doi:10.1038/360407a0. PMID 1448162.
- Layte, Richard; et al. (2006). The Irish study of sexual health and relationships. Dublin: Crisis Pregnancy Agency. p. 126. ISBN 1905199082. Retrieved 18 April 2012.
- Sundet, J.M., et al. Prevalence of risk-prone sexual behaviour in the general population of Norway. In: Global Impact of AIDS, edited by Alan F. Fleming et al. (New York: Alan R. Liss, 1988), 53–60.
- Norway world leader in casual sex
- Johnson AM, Wadsworth J, Wellings K, Bradshaw S, Field J (December 1992). "Sexual lifestyles and HIV risk". Nature 360 (6403): 410–2. doi:10.1038/360410a0. PMID 1448163.
- 3.6m people in Britain are gay – official
- UK gay, lesbian and bisexual population revealed
- Gibt es Heterosexualität?
- Jugendsexualität – Veränderungen in den letzten Jahrzehnten
- (Portuguese) LGBT proportions by sex in Brazil[dead link]
- Gary J. Gates PDF (2.07 MB). The Williams Institute on Sexual Orientation Law and Public Policy, UCLA School of Law, October 2006. Retrieved April 20, 2007.
Further reading 
- Diamond, M (August 1993). "Homosexuality and bisexuality in different populations". Arch Sex Behav 22 (4): 291–310. doi:10.1007/BF01542119. PMID 8368913.