I'm sure that it isn't typical to be that disgusted about sex as you mature, but you're far from alone either. I wonder if the person you were with before might have not been the right one for you, or you just weren't ready, and that might have something to do with it. Or, is it possible that you were reminded of being exposed to sex some other time when you were not ready? Might there be some feelings telling you that you are not allowed to enjoy it, maybe because you feel guilty, or there is a conflict with values? My point is that there is probably a reason for your reaction - not necessarily any of these, but there is probably something there.