Serious as Pleasure

Serious as Pleasure (1975) is a comedy, drama directed by Robert Benayoun rated 3.9/10.

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.