Yeah, you really need to put your foot down. I also had a fiancee like that. Never ever even tried to last. Of course he always said, "well, I try but it just hurts me too bad" whatever. Ever heard of stamina? He didn't give a hoot. He got what he wanted and when we were "done" (sorry when he was done) I was so freakin horny I wanted to die!
He also, didn't listen. Didn't really care if you ask me, because unless we shut them off then they will not change. I left him finally, of course this wasn't the only reason, but it was a big one. Sex is not everything, but it does matter.
I would sit him down and tell him exactly what you just told us. That he needs to please you or you are just not going to have sex anymore! Tell him, that you will just start pleasing yourself and he can do the same.
As for his cleanliness thing, is it just in bed? Or is he a germ freak all of the time? If it is all of the time, try not to let it bother you. It is probably just an ocd that he cannot control.
But, don't let it get out of hand either. Good luck and if he doesn't change leave him!