"Satyr" is good because of the vigorous sex. "Dream Quest" is good- well made, a variety of sex, and good settings. I like "Raw Straight Up"- beautiful men masturbating. This film is for women instead of the common film that is taylored for men.
My favorite one (and maybe my boyfriend's) is "Ancient secrets of the Kmasutra". Good looking actors (yes, the men too! and almost all the scenes are hot. It's directed by Brad Amstrong, so I became a fan after that and some of his other movies are good too (Flashpoint it's one of them).