See if this sounds familiar: (1)  A teenage girl becomes involved in sexual activity that most grownups, regardless of their own sexual behaviour as teens, find shocking and horrific. (2)  The girl’s parent or parents learn of the activity and are utterly devastated. (3)  A family crisis ensues, with outcomes that can range from good to horrendous. (4)  In their struggle to process shocking new information about the child they love, the distraught parent or parents construct a frame to explain and cope with this cognitive dissonance. (5)  The frame invariably posits the existence of a large but hitherto unacknowledged social problem that explains how...