A group of academics at the University of Montreal--most long time friends--plan to gather at the lakeside recreational home of Rémy and Louise, who have been together for 20 years, married for 15 of them, for dinner. Louise knows Rémy cheats on her, but believes he only does so when she is not around, which she accepts. Their recreational home is adjacent to many of the recreational homes of the others, who are: divorced Pierre and his much younger current girlfriend Danielle who is a student at the university; divorced mother Diane; independent-minded Dominque; single homosexual Claude; and graduate student Alain; While the four men prepare the dinner, the four women are working out together in the gym. The common factor between the two groups is the topic of conversation: sex, especially as it relates to themselves. But underlying each of the conversations is their own academic and intellectual backgrounds, which shapes the nature of the discussions. When the two groups finally converge for dinner, a ninth person is added peripherally, brusque working-class Mario, Diane's current sexual partner. This relationship is a first for Diane in that not only their sexual encounters but the way they interact with each other in general is predicated on S and M, dictated largely by Diane, the submissive. What happens with the group as dinner goes into evening and evening goes into morning is further shaped by them listening to a prerecorded interview Dominique did for CBC Radio earlier in the day to promote her new book, which discusses how the quest for individual happiness in modern western society is leading to the decline of the society in general.