Our culture touts free sex, but in reality life just does not seem to work this way. Sex is not free. The cost of attachment or resentment or insecurity often arises the morning after. In the past few years, particular attention has been given to sex at Harvard and Yale. In 2004, sophomores Camilla Hrdy and Katharina Cieplak-von Baldegg decided to start a magazine entitled H-Bomb, which the Harvard Crimson described as a “porn” magazine. The premiere issue included erotic fiction, nude photos and poetry about sex. In 2004, Eric Rubenstein, a Yale senior aiming for a Hollywood film career,...