Some sources have claimed that Natan's career in pornography did not end there. Joseph Slade suggests that Natan may have directed at least one hardcore pornographic film in Romania and produced and acted in at least 20 hardcore heterosexual and bisexual films between 1920 and 1927. Slade wrote that nearly all French pornographic films from this period which include bisexual and homosexual content were produced by Natan. The same source states that Natan himself was bisexual, and engaged in intercourse in "Le Menage Moderne de Madame Butterfly" (1920) and "La Maîtresse du Capitaine de Meydeux" (1924). Furthermore, Slade claimed that he introduced masochism into French pornographic film.