Originally Posted by
Slayer
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I Spit on Your Grave (not really underground nowadays but definitely a very nasty little film. If you like rape and revenge movies then you'll love this one cause this is one of the greats.)
Thriller: A Cruel Picture (Another staple in the rape/revenge genre and an all around good movie. And hardcore sex is always a plus :D)
I know there is a shitload more but for someone who wants to test the waters these movies are all great watches. I'm sure Cata has alot more to add so stay tuned.