BDSM / tie & tease and all that good stuff, you have to be in a particular mood and find the right girl for this.
I had a tie and tease session once where it resulted in a BJ and then she rode me while i was tied and blindfolded which was great.
then once, quite a few years ago, went to see a mistress to see what that was like, got tied up on this special bench (for want of a better word), small dildo up ass and all that and it was good, she then rode me for a finish.
weird thing was, i went back a few weeks later, and very unexpectedly, while i was tied up, her mate came round, the mistress sat on my face, while her mate wanked me off for a finish.
I think i would only ever go to one again, if sex was on the agenda or you would end up frustrated at the end.