- Cyril Val plays the janitor
- Daniel Trabet plays Mr Frojac
- Hubert Geral plays the visitor
- Jean-Pierre Lemercier plays the repair man
- Jacques Couderc plays the drunk man in the toilets (non sex)
All to the accompaniment of music playing on the radio with occasional shots of a young blonde female disc jockey (XNK6870).
Mr. Frojac makes love to his wife, Martine, and then goes off to work - and to satisfy his demanding secretary. Martine Frojac is doing the housework in her underwear when the janitor comes up to her apartment to deliver a parcel. They dance to the music and then have sex. The neighbour listens through the wall.
A visitor has sex with the janitor's wife in the basement and the neighbour returns to her apartment to masturbate on the bed, passing a telephone repairman in the hall. He spies on her through the keyhole and then bursts in and makes love to her.
Martine goes to a boutique and has lesbian sex with the dressmaker.
That evening the Frojacs go to a nightclub and Mr. Frojac follows his wife into the restroom where they have sex on a chair as people pass by.
Thanks to Skin Flick for identifying the movie and for additional cast information.