Dangerous Love Affairs(1959)

Original title: Les Liaisons dangereuses

Juliette de Merteuil and Vicomte de Valmont are a sophisticated couple, always looking for fun and excitement. Both have sexual affairs with others and share their experiences with one another. But when Valmont meets the beautiful young Marianne at a ski resort, he breaks the one rule of his unconventional marriage: never fall in love.