With casual hookups and campus rape relentlessly in the news, parents can be forgiven for feeling anxious about their young daughters. They’re also fearful about opening up a dialogue. Not Orenstein. A contributing writer to the New York Times Magazine and the New York Times best-selling author of books like Cinderella Ate My Daughter, Orenstein spoke to psychologists, academics, and other experts in the field and yes, 70 young women, to offer an in-depth picture of “girls and sex” today.