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Andrea Artusi (Ugo Tognazzi) is a successful businessman with a beautiful wife, Maria (Claudia Cardinale), and a happy marriage -- until he has an affair. After his own cheating, he starts to become obsessed with his wife's fidelity. Since she is one of the most desired women in town, he worries that it would be very easy for her to cheat on him. Now every time a man looks at his wife, Andrea goes crazy. Meanwhile, Maria finds out about her husband's affair and decides to plan her revenge. Wikipedia