Federico, Bruno, Pirro and Benny are married. The first three have beautiful wifes, Benny instead is married to a ugly woman. Ornella is Bruno's wife, she is very jealous and maintains that all men are deceitful, granted the opportunity, while Claudine, Federico's wife, maintains the contrary point of view. So they bet that Tosca, a former dancer, will succeed in seducing Federico. Troubles for everyone.