La Débandade (1999)

This French romantic comedy-drama concerns Claude Langmann, a middle-aged auctioneer, who is in a loving marriage with his second wife of 15 years. Though he is deeply in love with his wife and has remained faithful to her, he finds himself unable to perform in bed. His wife says she is satisfied with Claude's love and tenderness, but he visits a sex specialist anyway. There he learns of Viagra, which is not yet approved in France, though it is available in Switzerland over the counter. Soon Claude is on his way to Geneva, and eager to prove his manhood, tries to bed Agnes, his very attractive and very available assistant. His daughter, who also comes along for the trip, interferes with her own problems.