Irreversible is a french movie. infamous for it's 9 minute rape scene. this movie had worldwide distribution in cinemas.
Men Behind The Sun is a film from hong kong. based on a true story setting place in 2nd world war with experiments and torture scenes.
Salo, or the 120 Days of Sodom from italy/france is perhaps the worlds most infamous movie. directed by Pier Paolo Pasolini (who was killed by a gay prostitute)
Ichi The Killer by japanse director Takashi Miike. Rated R for strong perverse violence/gore and sexuality, language and drug content.
Murder-Set-Pieces. controversial american horror movie with excessive scenes of violence and sex.
Guinea Pig: Flowers of Flesh and Blood (Za ginipiggu 2: Chiniku no hana!) from japan. investigated by the FBI as there were suspicion the murders etc in the film was real.
Cannibal Holocaust from italy. banned in numerous countries. director had to show evidence in court to prove it was fake and not real murders etc.
Cutting Moments. american short film, just 29 minutes. incest-pedophilia-horror. user comment from imdb "I didn't see the end, because I had almost fainted"
Aftermath. spanish short film. 30 minutes. "This film is not just some glorified autopsy video, although it does show in amazing, realistic detail the process of an autopsy. Half way through the film, right when you are just getting used to the sounds and sights of a human body being ripped open and taken apart, the film changes into something much more depraved, vile, and deeply unsettling."

August Underground's Mordum. american film. Sickening. Depraved. Disturbing. Unsettling. Horrific. Disgusting. Brutal. Disconcerting. Repulsive. Upsetting. Sordid. Troubling. Nauseating. Ghastly. Filthy. Revolting. Nasty.