In October 1929 Jean-Paul Sartre and Simone de Beauvoir began their fifty-year love affair after meeting in Paris. Louise Hidalgo speaks to the writer and leading French feminist, Claudine Monteil, who knew Sartre and de Beauvoir, about their legendary status and their famously open relationship.Photo: Simone de Beauvoir and Jean-Paul Sartre sitting in a cafe in Paris, 1970. (STF/AFP/Getty Images)