L'Ennui was a frustrating movie. The lead character was so unsympathetic, which can be fine in a film, but he was too obsessed with this girl, getting to a sick degree. His violence, including raping her at one point, are the worst. Most disturbingly, Cecelia appears to enjoy the rape in that scene.
Sophie Guillemin who played the girl Cecilia was nice to look at, with or without clothes. The sex scenes were not explicit. He claims that she's not a good lover, but he's the one who appears to be terrible. She seemed to have a free love sexuality, which he could not handle. It's hard to understand why she stayed with him so long.
Overall, it was also a provoking movie, with frustrating romance. If you can handle these kind of characters, it's worth to watch.