Alban celebrates his 50th years and is afraid of losing his seduction potential. To feel more confident, he has an affair with Sylvia, a young woman of 25 years old who naively imagines that he could leave his wife. She falls for him and becomes dangerously invasive.
Patrick is having several extramarital affairs, wrongly convinced, that his companion is naive and unable to do so.
Aline feels terrified of falling in love. For her, sex is just possible outside of a love relationship.
Jean-Marc cannot help being unfaithful and finds a compromise with his wife Helen who allows him to have a date once a week, every thursday.
Three couples, three different stories, three ways to overcome infidelity, three ways to spice up their relationships. Through their experiences, the characters lead us to question our conception of the couple, love, loyalty and above all sex.