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heterosexuality
Heterosexuality is romantic attraction, sexual attraction or sexual behavior between persons of opposite sex or gender. As a sexual orientation, heterosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to persons 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."
Heterosexuality is one of the three main classifications of sexual orientation along with bisexuality and homosexuality, which are each parts of the heterosexual–homosexual continuum. Someone who is heterosexual is commonly referred to as ''straight.''
The term ''heterosexual'' or ''heterosexuality'' is usually applied to humans, but heterosexual behavior is observed in all mammals and in other non-human animals.
== History and demographics ==
The demographics of sexual orientation are difficult to establish due to a lack of reliable data. However, the history of human sexuality shows that attitudes and behaviour have varied across societies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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