Sociologist Amy Schalet was born in the United States, but she grew up in the Netherlands. When she returned to U.S. for college, she was surprised to learn that most of her American-reared peers had never discussed sex with their parents. Most of her Dutch friends had open, long-running discussions with their parents on the topic. This discovery shaped Professor Schalet’s research through graduate school and beyond. She’s published her findings in a new book, “Not Under My Roof: Parents, Teens and the Culture of Sex.” Professor Schalet’s work became well-known after she published an op-ed in The New York Times last June.