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Homosexuality refers to sexual attraction or sexual behavior between people of the same sex, or to a sexual orientation. As an orientation, homosexuality refers to "an enduring pattern of or disposition to experience sexual, affectional, or romantic attractions primarily to" people of the same sex; "it also refers to an individual’s sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them."

Homosexuality is one of the three main categories of sexual orientation, along with bisexuality and heterosexuality, within the heterosexual-homosexual continuum. The number of people who identify as homosexual — and the proportion of people who have same-sex sexual experiences — are difficult for researchers to estimate reliably for a variety of reasons. In the modern West, major studies indicate a prevalence of 2% to 13% of the population. A 2006 study suggested that 20% of the population anonymously reported some homosexual feelings, although relatively few participants in the study identified themselves as homosexual.

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