I typically hate techno music, but from a few experiences, I've found it helpdul during fast sex. :]

Also, strangely enough, I always enjoy slow, lyrical alternative music afterwards. My favorite is "Black" by Pearl Jam, which is bizarre because it's really a sad song. I always associate it with my boything and I, though. I can't hear it without thinking of post-sex cigarettes and that fabulous after-sex high I always get.