Dangerous Liaisons
Les Liaisons dangereuses (original)
Starring Gérard Philipe, Jeanne Moreau, Jeanne Valérie, Annette Stroyberg, Simone Renant, Jean-Louis Trintignant, Nicolas Vogel, Madeleine Lambert, Boris Vian, Gillian Hills
It's a drama and romance movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.