Bisexuality is romantic attraction as well as a sexual attraction including sexual behavior toward both males and females. The term is mainly used in the context of human attraction to denote romantic and sexual feelings toward both males and females. It may also be defined as encompassing romantic and sexual attraction to people of all gender identities or to a person irrespective of that person's biological sex or gender, which is sometimes termed pansexuality. Bisexual minor attracted people sometimes refer to themselves as childlovers. Bisexuality is often confused with these who engage in facultative homosexuality and situational homosexuality, which often lacks the romantic component and tends to be purely sexual in nature.
Bisexuality is one of the three main classifications of sexual orientation along with heterosexuality and homosexuality, which are each parts of the heterosexual–homosexual continuum. A bisexual identity does not necessarily equate to equal sexual attraction to both sexes; commonly, people who have a distinct but not exclusive sexual preference for one sex over the other, though still towards the middle of the sexual continuum, frequently also identify themselves as bisexual.
Bisexuality has been observed in various human societies and elsewhere in the animal kingdom throughout recorded history. The term bisexuality, however, like the terms hetero- and homosexuality, was coined in the 19th century.
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