In Alfred Kinsey’s sample of 8,000 women, 20 percent reported occasionally making some kind of “vaginal insertions” when they masturbated—though usually in addition to doing something directly clitoral. It was Kinsey’s opinion that many of these women penetrated themselves because their husbands liked to watch them, or because they didn’t know any better. It’s more likely that these women had discovered their G-Spot (or female prostate, or front-wall erotic
