Island Of Death (1977)
http://www.imdb.com/title/tt0188527/
Huge kudos to the horror channel for showing the full uncut version they genuinely risked being taken off the air for broadcasting it if non-horror fans saw it. It really is spectacular in terms of taboo breaking and sexual "depravity". It is undeniably mean spirited but gripping nonetheless. It really pushes things as far as it can and towards the end you are so bombarded with reprehensible scenes it will keep you thinking about it for days afterwards. Never a dull moment but you might want to take a shower after you'vce watched it-not for the easily offended of course but a must see for a very corrupt viewing experience.