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Homosexuality is romantic attraction, sexual attraction, or sexual activity between members of the same sex or gender. As an orientation, homosexuality refers to "an enduring pattern of or disposition to experience sexual, affectionate, or romantic attractions" primarily or exclusively 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. Scientific and medical understanding is that sexual orientation is not a choice, but rather a complex interplay of biological and environmental factors, especially with regard to early uterine environment. While there are those who still hold the view that homosexual activity is "unnatural" or "dysfunctional", research has shown that homosexuality is an example of a normal and natural variation in human sexuality and is not in and of itself a source of negative psychological effects. Prejudice and discrimination against homosexual and bisexual people have, however, been shown to cause significant psychological harm, and are especially damaging to children who are homosexual or bisexual. (via Freebase)