Too many to count really, but recently:
Red Room
Mermaid in a Manhole
Snuff (99.9% boring, with one fairly well done faux-snuff bit at the end)
and I have Kyôko vs Yuki to watch too, from Daisuke Yamanouchi (director of Red Room), which looked to be pretty controversial from the bits I skimmed through a found. Two chicks 69’ing, lesbian killers, strap-on rape… looks like a good’n 
