Over the last decade, philosophers of education have begun taking a renewed interest in Rousseau's educational thought. This is a welcome development as his ideas are rich with educational insights. His philosophy is not without its flaws, however. One significant flaw is his educational project for females, which is sexist in the highest degree. Rousseau argues that females should be taught to "please men…and make [men's] lives agreeable and sweet." The question becomes how could Rousseau make such strident claims, especially in light of his far more insightful ideas concerning the education of males. This paper attempts to make sense of Rousseau's ideas on the education of females. While I maintain that Rousseau's project for Sophie ought to be rejected, I argue that we should try to understand how this otherwise insightful thinker could make such surprising claims. Is it a bizarre inconsistency in his philosophical reasoning or an expression of his unabashed misogyny, as so many have claimed? I argue that it is neither. Rather, it is a product of his conception of human happiness and his belief in the irreducible role human sexual relations has in achieving and prolonging that happiness. For Rousseau, sex, love and happiness are inextricably connected, and he believes that men and women will be happiest when they inhabit certain sex roles--not because sex roles are valuable in themselves, but because only through them can either men or women hope to be happy.