her guesses appear reasonable, but in the course of making them the author repeatedly cherry picks data to make her points and in the process substantially weakens the book. One instance where this makes a chapter miss badly is on how economic liberation has affected sexual choices. Building from the work in Stepp's Unhooked, Ms. Rosin correctly notes that many young women play the hookup culture just as viciously as their male counterparts, and then adds a reasonable and interesting twist - that newfound academic and economic equality may have a role in their sexual behavior. However, as she attempts to advance "may have" to "does", Ms. Rosin loses the objective reader. Despite a good deal of peer reviewed research on what characteristics attract both genders in the modern era, the author largely ignores the interests of males save for the arbitrary division of them into "player" and "loser" classes and concluding "free agents" of the player class are uninterested in relationships. Women don't fare much better as her norm for behavior of "hard hearted" professional women becomes Wall Street traders, a curious choice as even their colleagues in finance consider that group as rather spectacular (to put it mildly) outliers of social behavior regardless of their gender. As to casual sex itself, there is nary a mention of the role that the perception of lower consequences for STIs has had versus a generation ago - Nirvana's "I'm so horny, but that's ok, my will is good" versus Girls' "All