Analysis of information sources in references of the Wikipedia article "西蒙·德·波娃" in Chinese language version.
…French novelist Simone de Beauvoir in 1908
During his time as a teacher, Sartre developed an obsessive passion for one 17-year-old pupil, before engaging romantically with her younger sister. De Beauvoir even aided Sartre in his relations with minors—grooming and teaching young girls before introducing them to him.
Sartre and Beauvoir liked to refer to their entourage as “the Family,” and the recurring feature of their affairs is a kind of play incest. Their customary method was to adopt a very young woman as a protégée—to take her to movies and cafés, travel with her, help her with her education and career, support her financially.... The ideal form for a Sartre and Beauvoir ménage was the triangle.
It is well established that she and Jean-Paul Sartre developed a pattern, which they called the “trio,” in which Beauvoir would seduce her students and then pass them on to Sartre.
…French novelist Simone de Beauvoir in 1908