Demographics of sexual orientation
Encyclopedia
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
Homosexuality
Homosexuality is romantic or sexual attraction or behavior between members of the same sex or gender. As a sexual orientation, homosexuality refers to "an enduring pattern of or disposition to experience sexual, affectional, or romantic attractions" primarily or exclusively to people of the same...

 and bisexuality
Bisexuality
Bisexuality is sexual behavior or an orientation involving physical or romantic attraction to both males and females, especially with regard to men and women. It is one of the three main classifications of sexual orientation, along with a heterosexual and a homosexual orientation, all a part of the...

 has to do with the nature of the research questions. Major research studies on sexual orientation
Sexual orientation
Sexual orientation describes a pattern of emotional, romantic, or sexual attractions to the opposite sex, the same sex, both, or neither, and the genders that accompany them. By the convention of organized researchers, these attractions are subsumed under heterosexuality, homosexuality,...

 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
Same-sex attraction
Same-sex attraction is a term occasionally used instead of the more common term homosexuality to refer to a person's feelings of sexual attraction toward members of the same gender identity....

 while the other set examines self-report data of personal identification as gay, lesbian, or bisexual
LGBT
LGBT is an initialism that collectively refers to "lesbian, gay, bisexual, and transgender" people. In use since the 1990s, the term "LGBT" is an adaptation of the initialism "LGB", which itself started replacing the phrase "gay community" beginning in the mid-to-late 1980s, which many within the...

. 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.

Incidence versus prevalence

Another significant distinction can be made between what medical statisticians call incidence
Incidence (epidemiology)
Incidence is a measure of the risk of developing some new condition within a specified period of time. Although sometimes loosely expressed simply as the number of new cases during some time period, it is better expressed as a proportion or a rate with a denominator.Incidence proportion is the...

 and prevalence
Prevalence
In epidemiology, the prevalence of a health-related state in a statistical population is defined as the total number of cases of the risk factor in the population at a given time, or the total number of cases in the population, divided by the number of individuals in the population...

. 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. It must also be understood that just because a person has had bisexual or homosexual thoughts does not mean they have an inclination to being bi- or homosexual, or that they will become bi- or homosexual.

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
Don't ask, don't tell
"Don't ask, don't tell" was the official United States policy on homosexuals serving in the military from December 21, 1993 to September 20, 2011. The policy prohibited military personnel from discriminating against or harassing closeted homosexual or bisexual service members or applicants, while...

 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
Alfred Kinsey
Alfred Charles Kinsey was an American biologist and professor of entomology and zoology, who in 1947 founded the Institute for Sex Research at Indiana University, now known as the Kinsey Institute for Research in Sex, Gender, and Reproduction, as well as producing the Kinsey Reports and the Kinsey...

's Sexual Behavior in the Human Male (1948) and Sexual Behavior in the Human Female (1953). These studies used a seven-point spectrum
Kinsey scale
The Kinsey scale, also called the Heterosexual-Homosexual Rating Scale, attempts to describe a person's sexual history or episodes of his or her sexual activity at a given time. It uses a scale from 0, meaning exclusively heterosexual, to 6, meaning exclusively homosexual...

 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
Orgasm
Orgasm is the peak of the plateau phase of the sexual response cycle, characterized by an intense sensation of pleasure...

 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
John Tukey
John Wilder Tukey ForMemRS was an American statistician.- Biography :Tukey was born in New Bedford, Massachusetts in 1915, and obtained a B.A. in 1936 and M.Sc. in 1937, in chemistry, from Brown University, before moving to Princeton University where he received a Ph.D...

, Frederick Mosteller and William G. Cochran
William Gemmell Cochran
William Gemmell Cochran was a prominent statistician; he was born in Scotland but spent most of his life in the United States....

, who stated much of Kinsey's work was based on convenience samples rather than random sample
Random sample
In statistics, a sample is a subject chosen from a population for investigation; a random sample is one chosen by a method involving an unpredictable component...

s, and thus would have been vulnerable to bias
Bias
Bias is an inclination to present or hold a partial perspective at the expense of alternatives. Bias can come in many forms.-In judgement and decision making:...

.

Paul Gebhard
Paul Gebhard
Paul H. Gebhard, born , was an American anthropologist and sexologist. Born in Rocky Ford, Colorado, he earned a B.S. and a Ph.D. from Harvard in 1940 and 1947, respectively. Gebhard followed Alfred Kinsey as the second director of the Kinsey Institute and served in that capacity from 1956 to...

, 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%.

Australia

2003
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
Lesbian
Lesbian is a term most widely used in the English language to describe sexual and romantic desire between females. The word may be used as a noun, to refer to women who identify themselves or who are characterized by others as having the primary attribute of female homosexuality, or as an...

 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.

Canada

1988
A study of 5,514 college and university students under the age of 25 found 1% who were homosexual and 1% who were bisexual.

1998
A stratified random sample of 750 males aged 18 to 27 in Calgary, Canada included questions on sexual activity and orientation. 15.3% of men "reported being homosexual to some degree" on the basis of three (often overlapping) measures of homosexuality: (1) voluntary, same-gender sexual contact from age 12 to 27: 14.0%; (2) overlapping homosexual (5.9%) and/or bisexual (6.1%) self-identification: 11.1%; and (3) exclusive (4.3%) and non-exclusive (4.9%) same-gender sexual relationships in past 6 months: 9.2%.

2003
A survey of 135,000 Canadians found that 1.0% of the respondents identified themselves as homosexual and 0.7% identified themselves as bisexual. About 1.3% of men considered themselves homosexual, almost twice the proportion of 0.7% among women. However, 0.9% of women reported being bisexual, slightly higher than the proportion of 0.6% among men. 2.0% of those in the 18–35 age bracket considered themselves to be either homosexual or bisexual, but the number decreased to 1.9% among 35–44 year olds, and further still to 1.2% in the population aged 45–59. Quebec and British Columbia had higher percentages than the national average at 2.3% and 1.9%, respectively.

Denmark

1992
A random survey found that 2.7% of the 1,373 men who responded to their questionnaire had homosexual experience (intercourse).

France

1992
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.

Norway

1988
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.

2003
According to Durex Global Sex Survey for 2003, 12% of Norwegian respondents have had homosexual sex.

United Kingdom

1992 this is amazign results
A study of 8,337 British men found that 6.1% have had a "homosexual experience" and 3.6% had "1+ homosexual partner ever."

2005
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
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

—around 6% of the total population or 1 in 16.66 people.

2010
A representative survey of 238,206 Britons, exclusive to their categories, found 1% were gay or lesbian and 0.5% were bisexual. A further 0.5% self-identified as "other", and 3% responded as "do not know" or refused to answer.

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.

Change over time

In addition, major historical shifts can occur in reports of the prevalence of homosexuality. For example, the Hamburg
Hamburg
-History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808...

 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.

Brazil

In 2009, in a survey conducted by University of São Paulo
University of São Paulo
Universidade de São Paulo is a public university in the Brazilian state of São Paulo. It is the largest Brazilian university and one of the country's most prestigious...

 in 10 capitals of Brazil, of the men 7.8% were gay
Gay
Gay is a word that refers to a homosexual person, especially a homosexual male. For homosexual women the specific term is "lesbian"....

 and 2.6% were bisexual, for a total of 10.4%, and of the women 4.9% were lesbian
Lesbian
Lesbian is a term most widely used in the English language to describe sexual and romantic desire between females. The word may be used as a noun, to refer to women who identify themselves or who are characterized by others as having the primary attribute of female homosexuality, or as an...

 and 1.4% were bisexual, for a total of 6.3%.

Of the men of the city of Rio de Janeiro
Rio de Janeiro
Rio de Janeiro , commonly referred to simply as Rio, is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper, making it the 6th...

, 14.3% were gay
Gay
Gay is a word that refers to a homosexual person, especially a homosexual male. For homosexual women the specific term is "lesbian"....

 or bisexual. Of the women of the city of Manaus
Manaus
Manaus is a city in Brazil, the capital of the state of Amazonas. It is situated at the confluence of the Negro and Solimões rivers. It is the most populous city of Amazonas, according to the statistics of Brazilian Institute of Geography and Statistics, and is a popular ecotourist destination....

, 10.2% were lesbian
Lesbian
Lesbian is a term most widely used in the English language to describe sexual and romantic desire between females. The word may be used as a noun, to refer to women who identify themselves or who are characterized by others as having the primary attribute of female homosexuality, or as an...

 and bisexual.
Rank City Percentage
of city
population
GLB Population
rank
1 Rio de Janeiro
Rio de Janeiro
Rio de Janeiro , commonly referred to simply as Rio, is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper, making it the 6th...

 
14.30% 1
2 Fortaleza
Fortaleza
Fortaleza is the state capital of Ceará, located in Northeastern Brazil. With a population close to 2.5 million , Fortaleza is the 5th largest city in Brazil. It has an area of and one of the highest demographic densities in the country...

 
9.35% 2
3 Manaus
Manaus
Manaus is a city in Brazil, the capital of the state of Amazonas. It is situated at the confluence of the Negro and Solimões rivers. It is the most populous city of Amazonas, according to the statistics of Brazilian Institute of Geography and Statistics, and is a popular ecotourist destination....

 
8.35% 3
4 São Paulo
São Paulo
São Paulo is the largest city in Brazil, the largest city in the southern hemisphere and South America, and the world's seventh largest city by population. The metropolis is anchor to the São Paulo metropolitan area, ranked as the second-most populous metropolitan area in the Americas and among...

 
8.20% 4
5 Salvador
Salvador, Bahia
Salvador is the largest city on the northeast coast of Brazil and the capital of the Northeastern Brazilian state of Bahia. Salvador is also known as Brazil's capital of happiness due to its easygoing population and countless popular outdoor parties, including its street carnival. The first...

 
8.05% 5
6 Brasília
Brasília
Brasília is the capital city of Brazil. The name is commonly spelled Brasilia in English. The city and its District are located in the Central-West region of the country, along a plateau known as Planalto Central. It has a population of about 2,557,000 as of the 2008 IBGE estimate, making it the...

 
7.95% 6
7 Belo Horizonte
Belo Horizonte
Belo Horizonte is the capital of and largest city in the state of Minas Gerais, located in the southeastern region of Brazil. It is the third largest metropolitan area in the country...

 
6.85% 7
8 Curitiba
Curitiba
Curitiba is the capital of the Brazilian state of Paraná. It is the largest city with the biggest economy of both Paraná and southern Brazil. The population of Curitiba numbers approximately 1.75 million people and the latest GDP figures for the city surpass US$61 billion according to...

 
6.55% 8
9 Porto Alegre
Porto Alegre
Porto Alegre is the tenth most populous municipality in Brazil, with 1,409,939 inhabitants, and the centre of Brazil's fourth largest metropolitan area . It is also the capital city of the southernmost Brazilian state of Rio Grande do Sul. The city is the southernmost capital city of a Brazilian...

 
5.95% 9
10 Cuiabá
Cuiabá
Under the Koppen climate classification, Cuiaba features a tropical wet and dry climate. Cuiabá is famous for its searing heat, although temperatures in winter can arrive sporadically at 10 degrees, indeed atypical, caused by cold fronts coming from the south, and that may only last one or two...

 
5.65% 10

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
UCLA School of Law
The UCLA School of Law is the law school of the University of California, Los Angeles. It has been approved by the American Bar Association since 1950. It joined the Association of American Law Schools in 1952.- History :...

.


Top Ranked by Percent:

Rank City Percentage
of city
population
GLB Population
population rank
1 San Francisco  15.4% 94,234 4
2 Seattle  12.9% 57,993 9
3 Atlanta  12.8% 39,805 12
4 Minneapolis  12.5% 34,295 16
5 Boston
Boston
Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...

 
12.3% 50,540 10
6 Sacramento
Sacramento
Sacramento is the capital of the state of California, in the United States of America.Sacramento may also refer to:- United States :*Sacramento County, California*Sacramento, Kentucky*Sacramento – San Joaquin River Delta...

 
9.8% 32,108 20
7 Portland
Portland, Oregon
Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

 
8.8% 35,413 14
8 Denver  8.2% 33,698 17
9 Washington  8.1% 32,599 18
10 Orlando
Orlando, Florida
Orlando is a city in the central region of the U.S. state of Florida. It is the county seat of Orange County, and the center of the Greater Orlando metropolitan area. According to the 2010 US Census, the city had a population of 238,300, making Orlando the 79th largest city in the United States...

 
7.7% 12,508 36


Top Ranked by Total Population:

Rank City Percentage
of city
population
GLB Population
population rank
1 New York City
New York City
New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 
6% 272,493 1
2 Los Angeles
Los Angeles, California
Los Angeles , with a population at the 2010 United States Census of 3,792,621, is the most populous city in California, USA and the second most populous in the United States, after New York City. It has an area of , and is located in Southern California...

 
5.6% 154,270 2
3 Chicago
Chicago
Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

 
5.7% 114,449 3
4 San Francisco
San Francisco, California
San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...

 
15.4% 94,234 4
5 Phoenix
Phoenix, Arizona
Phoenix is the capital, and largest city, of the U.S. state of Arizona, as well as the sixth most populated city in the United States. Phoenix is home to 1,445,632 people according to the official 2010 U.S. Census Bureau data...

 
6.4% 63,222 5
6 Houston
Houston, Texas
Houston is the fourth-largest city in the United States, and the largest city in the state of Texas. According to the 2010 U.S. Census, the city had a population of 2.1 million people within an area of . Houston is the seat of Harris County and the economic center of , which is the ...

 
4.4% 61,976 6
7 San Diego
San Diego, California
San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

 
6.8% 61,945 7
8 Dallas
Dallas, Texas
Dallas is the third-largest city in Texas and the ninth-largest in the United States. The Dallas-Fort Worth Metroplex is the largest metropolitan area in the South and fourth-largest metropolitan area in the United States...

 
7.0% 58,473 8
9 Seattle
Seattle, Washington
Seattle is the county seat of King County, Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country...

 
12.9% 57,993 9
10 Boston  12.3% 50,540 10
11 Philadelphia  4.2% 43,320 11
12 Atlanta
Atlanta, Georgia
Atlanta is the capital and most populous city in the U.S. state of Georgia. According to the 2010 census, Atlanta's population is 420,003. Atlanta is the cultural and economic center of the Atlanta metropolitan area, which is home to 5,268,860 people and is the ninth largest metropolitan area in...

 
12.8% 39,085 12
13 San Jose
San Jose, California
San Jose is the third-largest city in California, the tenth-largest in the U.S., and the county seat of Santa Clara County which is located at the southern end of San Francisco Bay...

 
5.8% 37,260 13

Rank City GLB GLB%
population
1 New York City
New York City
New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 – Northern New Jersey – Long Island, NY 
568,903 2.6%
2 Los Angeles
Los Ángeles
Los Ángeles is the capital of the province of Biobío, in the commune of the same name, in Region VIII , in the center-south of Chile. It is located between the Laja and Biobío rivers. The population is 123,445 inhabitants...

 – Long Beach, CA – Santa Ana, CA 
442,211 2.7%
3 Chicago–Naperville–Joliet, IL
Illinois
Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

 
288,478 3.1%
4 San Francisco – Oakland – Fremont, CA  256,313 3.6%
5 Boston
Boston
Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...

 – Cambridge, MA – Quincy, MA 
201,344 3.4%
6 Washington, D.C.
Washington, D.C.
Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

 
191,959 2.5%
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%
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