Piękna paranoja i Freud, czyli afera plagiatowa wokół teorii dwupłciowości Wilhelma Fließa

The article presents the dispute between Freud and Fließ concerning the bisexual theory of the latter. According to Fließ, Freud inadvertently conveyed the main ideas of this theory to his patient, Hermann Swoboda, who included them in his article, which he published. Not enough of this. The latter conveyed them to Otto Weininger, who also drew on them in his famous book Sex and Character. The result was public accusation of plagiarism made by Fließ against Swoboda and Weininger and the breaking of friendship with Freud. In the article, I argue that in this case the issue of alleged plagiarism is problematic and at least ambiguous, not allowing the formulation of categorical opinions.