Loving Couples (1980)

The romantic comedy Loving Couples (1980) stars Shirley MacLaine as a married woman who gets involved with younger man Stephen Collins. When her husband (James Coburn) finds out about the affair, he begins an affair of his own with Susan Sarandon, who also happens to be his wife’s lover’s roommate. There’s no nudity here, but check out Sally Kellerman covering her nakedness with a sheet in bed.