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Innate bisexuality (or ''predisposition to bisexuality'') is a term introduced by Sigmund Freud (based on work by his associate Wilhelm Fliess), that expounds all humans are born bisexual but through psychological development (which includes both external and internal factors) most become monosexual while the bisexuality remains in a latent state.〔(【引用サイトリンク】title=Trials from Classical Athens )〕 There is no modern scientific consensus as to how biology influences sexual orientation (see biology and sexual orientation). == ''Three Contributions to the Theory of Sex'' == In his ''Three Contributions to the Theory of Sex'' (1920), Freud discusses the concept of ''inversion'' (i.e. homosexuality) with respect to its ''innateness'', or the biological predisposition to homosexuality or bisexuality. The conclusions that he draws are based on the fact that at early stages of development, humans undergo a period of hermaphrodism. Based on this, he asserts that, "the conception which we gather from this long known anatomical fact is the original predisposition to bisexuality, which in the course of development has changed to monosexuality, leaving slight remnants of the stunted sex." This develops into a general theory that attraction to both sexes is possible, but that one is more common for each sex. He explains the inversion of homosexual attraction as the result of a traumatic episode or episodes that prevent the normal development of an attraction for the opposite sex. Freud famously characterized humans as naturally "polymorphously perverse," meaning either that practically any object can be a source of erotic fulfillment, or that babies are relatively indifferent to the object of erotic fulfillment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「innate bisexuality」の詳細全文を読む スポンサード リンク
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