The difference? A weeny half-inch ribbed nub on the higher front wall of your vagina. Scientists—and magazines (hi) and books and sex-toy companies and films and television shows and your roommates and your sex-ed teacher—reported that it had been a universal key to The Mysterious feminine climax. And therefore began the age when you were alleged to be able to say “it blew my mind” to your girlfriends at brunch….
