"In Serieux comme le plaisir, two men and a woman live quite happily together in a romantic liaison. The woman is probably wealthy anyway, so the trio doesn't worry much about money. One day they decide to take a trip in their beat-up car, managing the whole affair in their own special, insouciant manner. They are followed by a suspicious policeman who thinks there's something fishy about this group..."

• Paris-Cannes Productions
• Dovidis
• Jane Birkin
• Richard Leduc
• Raymond Bussières
• Georges Mansart
• Paul Demange
• Hubert Deschamps
• Marc Dudicourt
• Martine Kelly