Pourquoi pas!

I've seen this film more than 20 years ago, but last night it came back to my memory. The movie made me feel good and raised the longing, for why are we so exclusive in our loves. why isn't it possible to accept the loves of our beloved ? Hence the title. The film gives a nostalgic feeling to such a life. First it shows how the marriage à trois works, than a second woman is introduced. One of the men falls in love with her. You think, that this will be the end for the love of the others. That he will leave with his new love, but then.....It evokes the dream, that this is a possible situation, but it also shows, that everybody wants one, unique love. It is contradictory, but charming.