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.
Freud ve své knize Tři úvahy o sexuální teorii (Three Contributions to the Theory of Sex) z roku 1920 pojednává o konceptu inverze (tj. homosexuality) s ohledem na její vrozenost či biologickou predispozici k homosexualitě či bisexualitě.