CAPSULE: Against the background of an examination of the characters' sex lives, Melissa and Lee break up. Melissa and Lee's sex life is going great and she tells the other women about it, to their envy and amazement. They seem to be doing it all the time, unlike Gary and Susannah who are having a hard time fitting sex into their schedule with a new baby to take care of; in fact, he gets injured when he slips on a toy while attempting an encounter while Emma sleeps. Melissa and Lee are out with a couple of Lee's friends of his age, Stephanie and Robert. They end up going to a late-night rock club where a girl throws up on Melissa's shoes. At DAA the next day Melissa is worn out after the late night out. She tells Michael that the nightlife with Lee is boring. She begs off going out on the town with Lee again which causes some tension for a while which is succeeded by--sex! At the Weston's house, Nancy is concerned when she finds copies of Playboy under Ethan's bed. Elliot makes a cand