Do teen sleepovers prevent pregnancy? One researcher says yes and explains why

A shocking approach to preventing teen pregnancy: Allowing teens to have sleepover dates with their boyfriends or girlfriends.

Sociologist Amy Schalet is talking about it in her new book "Not Under My Roof: Parents, teens, the culture of sex," just out from the University of Chicago Press. And get this – she says the sleepover strategy is already working in other countries.

Amy Schalet joins CNN's Ali Velshi this morning to explain why supervised sleepovers work.