here are some comments from imdb;
"Personally I loved this film....if you can use "love" to describe a movie that battered me, sickened me, mesmerized me, drained me and left me feeling as if I had been kicked in the gut. Judging by the faces in the audience at last year's VIFF I was not alone in this."
"The "Rectum" was in fact a genuine gay S&M club in Paris. The crew changed the name, redressed the set and added red lighting. The club was spread across the basements of three separate buildings and was so cavernous and confusing that many of the crewmembers became claustrophobic in it."
"The first 30 minutes of the film has a background noise with a frequency of 28Hz (low frequency, almost inaudible), similar to the noise produced by an earthquake. In humans, it causes nausea, sickness and vertigo. It was the main cause of people walking out of the theaters during the first part of the film in places like Cannes and San Sebastian. In fact, it was added with the purpose of getting this reaction"
"The French DVD release proudly proclaims in the blurb on the back that of 2,400 people at the film's Cannes premiere, 200 walked out."