In this survey, 80% of people worldwide identified as heterosexual, 3% as homosexual, 4% as bisexual, and 1% each as pansexual, asexual, and other. For some countries the samples were weighed for representativity, but in others with less internet access, they skewed more urban. In 2021, Ipsos interviewed people in 27 countries spanning all continents on their sexual orientation and gender identity. Ī small number of people do not feel sexual attraction and identify as asexual, which can be considered a sexual orientation in itself or a lack thereof. The International HIV/AIDS Alliance estimates a worldwide prevalence of men who have sex with men between 3 and 16 percent. An analysis of 67 studies found that the lifetime prevalence of sex between men (regardless of orientation) was 3–5% for East Asia, 6–12% for South and South East Asia, 6–15% for Eastern Europe, and 6–20% for Latin America. Surveys in Western cultures find, on average, that about 93% of men and 87% of women identify as completely heterosexual, 4% of men and 10% of women as mostly heterosexual, 0.5% of men and 1% of women as evenly bisexual, 0.5% of men and 0.5% of women as mostly homosexual, and 2% of men and 0.5% of women as completely homosexual. Men are more likely to be exclusively homosexual than to be equally attracted to both sexes, while the opposite is true for women. Bisexuality comes in varying degrees of relative attraction to the same or opposite sex.
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Survey type, questions and survey setting may affect the respondents' answers. Overall, fewer research subjects identify as homosexual or bisexual than report having had sexual experiences or attraction to a person of the same sex. 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 homosexual or bisexual. The studies tend to pose two sets of questions. Most of the studies on sexual orientation rely on self-reported data, which may pose challenges to researchers because of the subject matter's sensitivity. It is difficult to exactly grasp the distribution of sexual orientations, including the size of the lesbian, gay, and bisexual (LGB) population.
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Tables comparing several cities' population numbers are also included below. This article lists demographic studies of sexual orientation from different countries. Obtaining precise numbers on the demographics of sexual orientation is difficult for a variety of reasons, including the nature of the research questions.