"Daddy! Stop hurting Mommy!" We've all heard the horror stories of baby walking in on mommy and daddy's intimate moments. At a recent playgroup, one youngster said to my daughter, "My mommy and daddy were playing doctor last night." When I looked up at the mother, she was beet red and she apologized for her child's honest confession. We laughed it off and moved on to more appropriate playground conversation. But it got me thinking, how do parents keep from getting busted between the sheets? Some lock the door during the bedtime romp while others just risk the interruption. What do you do to keep your sex life private?