As far as the movies plot, I have nothing further to add. I think your review and those posted by other readers of your site have left nothing of the nature of the tale left unsaid. There is however, another more sinister plot at work here. It is the use of unnecessary and gratuitous nude body shots throughout the film. I am aware that in a film about rape I will probably have to sit through uncomfortable shots of a violent and brutal act, which by the way I often find unnecessary since I have an imagination that works.
Film is a powerful medium.
Stories about this subject matter are also powerful and important. The impact of any attempt to try and beautify any aspect of a brutal gang rape and then present it full force upon the general public cannot be known. I feel this film offers us a disturbing view of not only the directors mind but the machine called Hollywood. If you want to use sex to sell a movie, then I feel you must act somewhat responsibly and so does everyone else, that is why we have movie rating systems. By using the guise of being necessary to the story, the people responsible allowed angle after angle and shot after shot of this beautiful young woman's body into their film.