Demon Lover

Just rented this, it has all the great elements of a pretentious foreign film:

-French
-Misleading title
-Stylish clothing
-Abrupt ending
-May have something to do with sex

What's it about?  Why, the seedy hentai website underground.  Yes, I watched it just for that.  Quite entertaining.

never heard of it, do you have a link to a summary or something

No, it's obscure, but it has a brief cel animated and 3D animated scene.