Homosexuality is romantic attraction, sexual attraction , or sexual behavior between members of the same sex or gender. It "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. Along with bisexuality and heterosexuality , homosexuality is one of the three main categories of sexual orientation within the heterosexual—homosexual continuum. The most common adjectives for homosexual people are lesbian for females and gay for males , but the term gay also commonly refers to both homosexual females and males. The percentage of people who are gay or lesbian and the proportion of people who are in same-sex romantic relationships or have had same-sex sexual experiences are difficult for researchers to estimate reliably for a variety of reasons, including many gay and lesbian people not openly identifying as such due to prejudice or discrimination such as homophobia and heterosexism. Many gay and lesbian people are in committed same-sex relationships, though only since the s have census forms and political conditions facilitated their visibility and enumeration.
History of HIV/AIDS
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Gay sexual practices are sexual activities involving men who have sex with men MSM , regardless of their sexual orientation or sexual identity. Evidence shows that sex between men is significantly underreported in surveys due to social desirability bias. Various sex positions may be performed during sexual activity between men. Historically, anal sex has been popularly associated with male homosexuality and MSM. Many MSM, however, do not engage in anal sex, and may engage in oral sex , frottage or frot , or mutual masturbation instead. Among men who have anal sex with other men, the insertive partner may be referred to as the top , the one being penetrated may be referred to as the bottom , and those who enjoy either role may be referred to as versatile.
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