The film follows musical composer George Webber (Dudley Moore) as he goes through a midlife crisis. Much to the chagrin of his actress girlfriend Samantha Taylor (Julie Andrews), George starts ogling younger women and conspicuously spies on his next-door neighbor who frequently hosts orgiastic parties.
Suddenly he spots an exotically beautiful young woman by the name of Jenny (Bo Derek), who's on her way to her wedding. George then makes it a goal of his to have an affair with her, even though she's newly married, and even if he has to follow her and her husband to Mexico on their honeymoon.
This film is Best Known for the Fanservice, as Bo's sexy one-piece swimsuit and cornrow-festooned hair made her a locker-room-poster sensation in the late seventies, dethroning the previous reigning pin-up queen Farrah Fawcett.
This film contains examples of the following tropes:
- Boléro Effect: Maurice Ravel's signature piece is, according to Jenny, the perfect music to make love to. In this case, the effect may well be the... um... climax.
- Dirty Old Man: George, no doubt.
- Distracted by the Sexy: George is so distracted when a car bearing Jenny drives by that he drives right into another car. A police car.
- Lucky Charms Title: Officially, the quotation marks around "10" are part of the film title.
- Ms. Fanservice: Take a wild guess.
- One-Word Title: Also a Title by Number.
- A Party, Also Known as an Orgy: Takes place on a regular basis next door to George's house.
- The Peeping Tom: George and his next door neighbor with their telescopes. They know they're spying on each other to boot.
- Polyamory: Jenny and David have an open relationship, as George eventually learns to his dismay.
- Pretty Fly for a White Guy: Jenny's cornrows had been a popular hairstyle for black people throughout most of the seventies.
- Pyrrhic Victory: George gets to hook up with Jenny, but he's not too thrilled about it anymore once he learns Jenny and David are in an open marriage.
- Stalker with a Crush: George, as soon as he meets Jenny. This is a bit of Values Dissonance, as this wasn't taken nearly as seriously at the time.
- Title by Number: Also a One-Word Title.