I've never really had a disatrous fuck, although I've had funny ones.

My ex and I were having sex one night after we had gotten home from the bar. We were both wasted and we were going at it hardcore, whenever I started feeling like I was going to throw up. Needless to say, about 10 seconds after I informed him I wasn't feeling well (we still kept banging), I hurled right in his trash can that was beside his bed... all naked and stuff. It was gross, but I cleaned up and we finished our little fuck session.