Andrea Artusi is a successful businessman with a beautiful wife, Maria, 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.

Orazio Menicotti is a night policeman in Rome. One night he is present at a quarrel between husband and wife and he volunteers to take the wife to the Police Station. While he goes around Rome with the blonde and beautiful woman, a bank is robbed.

Adolfo Cocchi has a building firm but his plan to build a set of buildings is been stopped by an old former Garibaldian, Don Leopoldo, who refuses to sell his property. A group of young people go to his house to play and sing. Marcella, Cocchi's daughter, who has a beautiful voice, goes to visit Leopoldo and falls in love with Paolo. They have an idea: open a night-club called "Io bacio... tu baci"...