Simone de Beauvoir (1908-1986) The author of The Second Sex may be known as the mother of  French feminism, but that's just about the only maternal thing about  Simone de Beauvoir. Freed from the confinement of marriage by her  family's inability to provide a dowry, she rejected religion as a  teenager and eventually fell in with Jean-Paul Sartre's existentialist  crowd. He and Beauvoir maintained one of the most revolutionary  relationships of their time. Although she refused his marriage proposal  in 1931 and the couple never cohabited, they remained lovers and trusted  colleagues until his death five decades later. While each was the  other's primary partner, both were open about their affairs, and  sometimes they shared girlfriends. And if, for some reason, that isn't  enough to qualify Beauvoir as a bad girl, kindly recall that she also knew how to take a sexy photo. (From Flavorwire's 10 Legendary Bad Girls of Literature)
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