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As long as the LW's son doesn't start treating Dad's house like Hef's Grotto then there seems to be no reason for concern. At least the girl had enough manners to take her shoes off at the door. The fact that the LW was awakened by a need for a drink of water rather than connubial sound effects should be clue enough to leave this one alone. Mutual embarrassment would surely follow any kind of confrontation, however gentle. He'll stop bringing his dates home and make a mess in the LW's Jetta instead. My advice to him (As long as it's a given that he and the boy have had "the talk") is to jam his fingers in his ears and repeat after me - LALALALALALALA!