I'm not a big fan of French director/actor Jean-Marc Barr who co-directed this and has a supporting role. He is somewhat of an acolyte of Lars Von Trier, but he actually somewhat deserves the criticism that various ignorami are always making about Von Trier and other Euro "arthouse" director. His films are rather pretentious and he does to some extent try to pass off porn as art.
This movie about a naive young girl who falls in love with a bisexual hustler and serial killer may be a little pretentious in that it owes an obvious debt to the Jean-Luc Goddard French classic "Breathless". It's definitely heavy on the sex. Barr-regular Pierre Perrier is one of the prettiest pretty-boys in the land of wine of truffles. He's not especially believable as vicious serial killer, but he would probably be a great cellmate if you were doing life in prison. Lizzy Brochere is a little more talented and bilingual and she really made an impression (her beauteous bare butt especially)when she appeared on American TV in the second season of "American Horror Story". I don't know which of these two has more nude scenes, but probably Perrier. The most memorable might be when HE gives HER a long lapdance and you can see why Barr also prominently cast him in his "arty" hardcore porn film "Sexual Chronicles of a French Family" (unfortunately, he couldn't get Brochere, but it was probably better for her international career that he didn't).
This is actually not a BAD movie though. At least for the first half. Both actors do a decent job, especially Brochere who--in another nod to "Breathless"--is supposed to be an "American" girl (well, half-American anyway). There's an interesting scene in the middle where they return to the guy's hometown where everyone blames him for the suicide of his childhood friend. I wish they had done more with this plot thread, but the movie just becomes very repetitive after that with the pair picking up teenage hustlers for the purposes of sex and murder. The ending is disappointing and lot of added-on text about serial killers might be interesting if you've never seen the 1 million movies they've made in America about serial killers. Ultimately, this movie doesn't offer much insight on the serial killer phenomenon (which would be a dubious achievement anyway), but it certainly does create a tres SEXY pair of them.