Agreed on PureTaboo, GirlsWay is decent too, if you're looking for lesbian.
Or look for those old school smut movies, where they make a movie to squeeze in as much sex as they can. Still not really fantastic plot, but at least they pay some attention to that, and the feel and aesthetics are different enough from today's films to be interesting. Lots of bushes though. If you want, search for the director Tinto Brass. I like Trasgredire (or Cheeky in English)