Does the kidnapping make any sense? (spoilers)
So these two are kidnapped by some pornographers just to make a dirty scene between brother and sister, and then released. I could never digest such a premise, and I was looking for an explanation throughout the whole movie, but of course, none came. I know the movie claims to be based on real facts, but I honestly think that putting that disclaimer at the beginning of the film was the only way the director could think of to make the audience buy it. And the final commentary about the thousands of victims of clandestine pornography... Come on, pornography is not fabricated at gunpoint, there are so much easier ways to do it. Besides, the kidnappers-pornographers were not scary at all, they could hold a gun, all right, but they were never ever going to shoot anybody. They don't use the faintest violence against their victims, they don't bother to cover their faces, and they deliver their threats without the slightest conviction (this could be due to poor acting, but it certainly doesn't help the story).
Actually, and unlike some reviewers, I did like the psychological study of the trauma and I enjoyed the slow pace of the movie, which nevertheless doesn't lose tension. I just think the conflict is good as a dramatic idea (what'd happened if you're forced to have sex with your sister?) but never gets justified.