David Wozniak is a perpetual adolescent who discovers that, as a sperm donor, he has fathered 533 children. He is advised that more than 100 of his offspring are trying to force the fertility clinic to reveal the true identity of "Starbuck," the pseudonym he used when donating his sperm. To make matters worse, his girlfriend Valérie is pregnant with his child, but doesn't feel that he is mature enough to be a father.

At the hospital, three brothers meet at the bedside of their mother in a coma. To pass the time, they discuss the merits and pleasures of marital fidelity and infidelity. The conversations of the two youngest advance as the days go by in increasingly juicy details and fantasies, which will push them to act against the morals and more solid values ​​of the eldest.