Even holding hands felt like it came with the risk of humiliation. When he went to college he met a girl, Jeannie, who invited him back to her dorm room to fool around. He wasn’t able to perform, and blamed it on the weed he’d been smoking all night. She texted him the next day, inviting him over to try again. “But the more he thought about it,” Orenstein writes, “the more anxious he became.” Once again, his attempts at intimacy fizzled. For Orenstein, who’s spent two decades writing about the sexuality of girls — with bestsellers like “Girls & Sex” and “Don’t Call Me Princess” — Mason’s predicament was difficult to take seriously at first