"Peggy Orenstein's 'Girls & Sex' broke ground, shattered taboos, and galvanized conversations about young women's right to pleasure and agency in sexual encounters. It also had an unintended effect on its author: Orenstein realized that talking about girls is only half the conversation. To understand girls and sex, we also need to talk about boys and sex. Today's young men are subject to the same cultural forces as their female peers. They are steeped...