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Heterosexuality is the romantic attraction, sexual attraction or sexual behavior between people of different sex. As a sexual orientation, heterosexuality is: "A lasting pattern of emotional, romantic and / or sexual attractions towards people of the opposite sex"; also "refers to the sense of identity of a person based on those attractions, related behaviors and belonging to a community of other people who share those attractions." Along with bisexuality and homosexuality, heterosexuality is one of the three main categories of sexual orientation within the heterosexual-homosexual continuum. The term heterosexual or heterosexuality is usually applied to humans, but heterosexual behavior is observed in almost all mammals and other animals.