STRENGTHENING FAMILY BONDS by letting your teenagers have sex at home. Given my gloriously misspent youth, I’m not going to adopt Kruiser’s line here. But I will note that this is probably one reason for so many 20-somethings never moving out. In the old days, living under your parents’ roof put a crimp in your sex life, which was a major incentive to move out and live like an adult. Now, not so much . . . . I don’t know if Amy Schalet discusses that aspect or not.