Three couples of friends, who seem to have everything for them, are still looking for the missing ingredient in their lives. One evening, Nicolas and Valerie who live a rather harmonious relationship decide to introduce two other couples to the decadent world of a swingers club where they have been secretly attending for a few years. During a supper audacious Valerie reveals her desire to introduce them to this sexual practice. The idea pleases the men, Charles and Luc, but their respective spouses, Veronique and Lisa are reluctant.