Ramon, a psychology student, is a good-looking young man with little willingness to do honest work. He lives in the anteroom of his cousin’s office, Sergio, a dentist who is fascinated by him. Bothered by the constant presence of women brought by Ramon and to get him out of his office, Sergio convinces his cousin to respond to a magazine ad proposing a couples exchange. Ramon talks to Cris, a friend from college, who agrees to pretend to be his wife and perhaps blackmail some industrialist looking for adventure. Lonely bourgeois, Felipe and Rosario, the ad couple, invite Ramon and Cris to spend a weekend in Guaruja. Felipe is interested in Cris and proposes a serious relationship. Cris accepts and ends up revealing Ramon’s true intentions. Felipe then sets a plan to unmask him but impressed by Ramon’s physical gifts, Rosario intercedes on his behalf.