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Although Michael (Tim Matheson) is an unrepentant sex addict who has cheated on his girlfriend, Katherine (Kate Capshaw), repeatedly throughout their relationship, she's so convinced he'll change once they're married that he also begins to believe it. But, despite the advice of his psychologist brother, Tommy (Edward Herrmann), Michael begins to feel the urge to stray when he meets classical musician Philomena (Wendie Malick), and soon his young marriage is in crisis. Wikipedia