Gender differences in sexuality have gained considerable attention both within and outside of the scientific community. We argue that one of the main unacknowledged reasons for these differences is simply that women experience substantially worse sex than men do. Thus, in examinations of the etiology of gender differences in sexuality, a confound has largely been unacknowledged: Women and men are treated to different experiences of what is called “sexuality” and “having sex.” We discuss four arenas in which women’s experience of sexuality may often be worse than men’s: (a) anatomical differences, (b) sexual violence, (c) stigma, and (d) masculine cultures of sexuality. Then we consider how each disparity might explain well-known gender differences in sexuality.