Jose Luis is an executive at his parents underwear factory where his girlfriend Sylvia works on the shop floor. When Sylvia becomes pregnant, Jose Luis promises her that he will marry her, most likely against the wishes of his parents. Jose Luis' mother is determined to break her son's engagement to a girl from a lower-class family, and hires Raul, a potential underwear model and would-be bullfighter to seduce Sylvia.
Parisian everyman Antoine Doinel has married his sweetheart Christine Darbon, and the newlyweds have set up a cozy domestic life of selling flowers and giving violin lessons while Antoine fitfully works on his long-gestating novel. As Christine becomes pregnant with the couple's first child, Antoine finds himself enraptured with a young Japanese beauty. The complications change the course of their relationship forever.
Diana is a Roman wife happily married to sympathetic Paolo but she is keen on playing benign games of seduction with other men while resisting the advances of chic lingerie shop owner Silvio. She narrates her adventures to Paolo in order to stimulate their otherwise monotonous sexual life. However, under the influence of her lesbian friend Antonietta and raunchy sister Nadia, Diana starts to move the ongoings further while Paolo is still prone to believing that events narrated by her are merely fantasies.
A New York girl sets her father up with a beautiful woman in a shaky marriage while her half sister gets engaged.
A man tries to warn his brother away from the new girlfriend he brings home during Thanksgiving, but ends up becoming infatuated with her in the process.
After twenty years of marriage, art professor Nino Rolfe attempts to break down his wife Teresa's conventional modesty. Noticing her affection for their daughter's fiancé, Nino instigates her sexual interest in him as well. This sets off a chain of unexpected events and emotional complications, as Nino and his unpredictable fascist daughter find that they both enjoy being jealous.
A veteran high school teacher befriends a younger art teacher, who is having an affair with one of her 15-year-old students. However, her intentions with this new "friend" also go well beyond platonic friendship.
At a college in Rome, a professor, nicknamed "Dodo" is in a deep depression. His stunningly beautiful wife has just left him for another man. Dodo wants her back very badly and has erotic daydreams about her. A beautiful young student in his class asks him for a ride home and seduces the lucky man, but still he wonders about his wife and her lover.