L'Affaire D'Une Nuit on AllMovie

The protagonists in this routine sexual drama are less than appealing, which makes involvement in their one-night peccadillo a difficult challenge. Catherine (Pascale Petit, on her way to making a spate of movies in this decade) and Michel (Roger Hanin) meet when Michel runs into an old school friend who happens to be Catherine's husband. The husband asks Michel to give Catherine a lift to her next destination and after he agrees, the two set out in the car. Before many miles have passed, a lusty flirtation is well underway and the strangers decide to spend a wild night together. The results of this indiscretion are much worse than either could have realized.