Red Shoe Diaries 3: Another Woman's Lipstick(1993)

Just Like That: A receptionist in a large firm cheats on her voyeuristic lover with a delivery boy who has a crush on her. Another Woman's Lipstick: A young wife discovers lipstick on her husband's collar. She follows him, meets his mistress, and has a lesbian fling with her. Talk To Me, Baby: A man caught cheating in a bar by his wife admits his past dalliances on the drive home, which gets his wife aroused.