This three-part movie begins with a young woman married to an older, cold-hearted man in the year 1200. Two rivals have a swordfight over the affections of the woman. Part two takes place in 1910 and finds an amorously unfaithful wife taking on her many lovers while her unsuspecting husband lurks nearby. The final part finds a count and countess engaging in extramarital affairs in France during the 1840s.

Erotic comedy about an incorrigible womanizer whose lecherous love life becomes too much to handle. Things culminate when his jealous friends arrange for his fiancee and his mistresses to meet him at the same time.

Philippe, a photography enthusiast, is attracted to his young aunt so he makes a plan to get his uncle involved with their maid in order to get the chance to have sex with his aunt.

Pierre is a free-lance glamour photographer who always has to hassle his penny-pinching employer just to get paid while his bored spouse Françoise stays home all day, trying to keep up a semblance of housekeeping. A former model who has apparently done well for herself, Sylvie, makes a pass at Pierre and invites him to her house in the country for the weekend. Claiming an assignment to his unsuspecting spouse, he decides to take her up on it, only to learn that she too is married to the very open-minded Michel who even brings them breakfast in bed after a night of unbridled passion . As a lark, perhaps deciding that turnabout is fair play, Michel travels to Paris to console the lonely housewife, luring her into a threesome with a casual pick-up.

The story of a hotel boss that, from time to time, observes the couples in the rooms and even films them.

The third in a series of films featuring François Truffaut's alter-ego, Antoine Doinel, the story resumes with Antoine being discharged from military service. His sweetheart Christine's father lands Antoine a job as a security guard, which he promptly loses. Stumbling into a position assisting a private detective, Antoine falls for his employers' seductive wife, Fabienne, and finds that he must choose between the older woman and Christine.

The young artist Wanda Leibovitz comes to Paris, hoping to forget unfortunate love. Soon after arrival directly at the station Wanda meets the mysterious old woman suggesting to rent at it the room (whom the old woman, allegedly, held ready for the now deceased sister). Wanda doesn't know yet that this room will change all her life shortly after it slightly opens a mysterious forbidden door.