Renato, a very effeminate gay who is called "Marlene" in honour of Marlene Dietrich, because of a promise he made for his sick grandmother, he must try the opposite sex at least one time. He think he has a chance with Ginevra, a fond lesbian leader of the rock band "The fucking sisters". She has already discovered her girlfriend with a man, so she decides to find out how it feels to have sex with a man. Curiously, they met on a wedding of a common relative, so they both think their partner is straight.