The original French title is slang for "balls" (the testicular variety).
In reference to the scene on the train Brigitte Fossey said, "I was supposed to breastfeed a child but I had no milk. I then smeared my breasts with honey and the baby saw nothing but fire".
The scene with Gérard Depardieu, Patrick Dewaere and Miou-Miou in bed together was considered shocking for 1974 audiences. Depardieu would have a similar scene only a few years later co-starring with Robert De Niro and Stefania Casini in 1900 (1976).
In an interview, Miou-Miou said that she kept from this film "a very powerful memory, very collective, with Dewaere and Depardieu. We were sometimes asked to do things that were not hard, but a little complicated to do. By dint of pulling down my panties and pulling up my apron, I was getting a little tired of it. The three of us loved each other very much. We were like a litter of puppies."
One of the most erotic scenes of this movie takes place in an empty train. A young woman, alone in a wagon with the two heroes of the film, "has the unfortunate idea of breastfeeding her baby". A rather raw sex scene follows, where Patrick Dewaere sucks the breast of the young woman who finally takes pleasure herself. Brigitte Fossey who slipped into this role, "was not scared", but Bertrand Blier remembered a moment when the actress was a little afraid. "She felt a little dizzy when she found herself stuck between the two guys, one sucking her and the other teasing her from behind, at which point she said to me 'not that'. It was trying for her, but she certainly has good memories of it.," Blier recalled, laughing.