Heterosexuality
Attraction between people of the opposite sex or gender / From Wikipedia, the free encyclopedia
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Heterosexuality is romantic attraction, sexual attraction or sexual behavior between people of the opposite sex or gender. As a sexual orientation, heterosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to people of the opposite sex; 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."[1][2] Someone who is heterosexual is commonly referred to as straight.
Along with bisexuality and homosexuality, heterosexuality is one of the three main categories of sexual orientation within the heterosexual–homosexual continuum.[1] Across cultures, most people are heterosexual, and heterosexual activity is by far the most common type of sexual activity.[3][4]
Scientists do not know the exact cause of sexual orientation, but they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences,[5][6][7] and do not view it as a choice.[5][6][8] Although no single theory on the cause of sexual orientation has yet gained widespread support, scientists favor biologically based theories.[5] There is considerably more evidence supporting nonsocial, biological causes of sexual orientation than social ones, especially for males.[3][9][10]
The term heterosexual or heterosexuality is usually applied to humans, but heterosexual behavior is observed in all other mammals and in other animals, as it is necessary for sexual reproduction.