“Girls can't be guys in matters of the heart, even though they think they can,” says Laura Sessions Stepp, author of Unhooked: HowYoung Women Pursue Sex, Delay Love, and Lose at Both, published in 2007. In her view, “hooking up”-casual sexual activity ranging from kissing to intercourse-places women at risk of “low self-esteem, depression, alcoholism, and eating disorders.” Stepp is only one of half a dozen journalists currently engaged in the business of detailing the dangers of casual sex.