General exploitation and/or low-budget extreme garbage cinema from any country is good stuff.
Jess Franco has a lot of interesting titles. AWFUL DR. ORLOFF and all his more sleazy stuff. Not so much a fan of the more recent shot-on-video crap though. It just looks like terrible.
What's some of your favorite classic adult flicks, backdoorman? I just watched AMANDA BY NIGHT with Veronica Hart and thought that one was pretty good.