This is a gem of a "noir" movie showing various character in a self-destructive descent into hell. This is not really a portrayal of the porn business, but much more. A young guy is fascinated by two poseurs taking snapshots and agrees to introduce to them a girl, Zoé, he watches from afar. The two rich brats accept him as Zoé's "chaperon", but they soon turn her to the porn business. This could be sub-Tarantino territory, but Dahan actually fleshes out his characters, introduces real humanity and, if we know this will all end in tragedy, the "how" remains fascinating. This is great, sincere stuff.
