Wait a minute ... OMG I can't believe it, I've been looking at this thread and thinking essentially "how can ANY orgasm be bad, even a BYO ..." and I just remembered ... oh jeez:
I had a one night stand, one and only time, with a guy I was friends with ... long story short, we were phone buddies through a mutual friend, and he kept pissing and moaning how hard up he was and hadn't been with anybody since he broke up with his long term girlfriend ... eventually he mentioned this one too many times and caught me in the right mood and I said let's go.
I wasn't exactly attracted to him, but I liked him as a person, and I was bored -- now I knew that's the wrong reason to be intimate with someone, but we all know what this is called ... a pity f*ck, I just didn't know there was a proper name for it at the time.
So blah blah blah, yadda yadda yadda, go back to his place and ... well, about 3/4s of the way through "The Act" he's thanking me ... repeatedly ... in rhythm to his breathing ... alternating with telling me how great it feels ... (God I am cringing as I type this, use your imagination ... puff puff -- thank you -- puff puff -- it feels so good puff puff -- oh god thank you ...)
Now I ask you, what do you SAY at a time like that??? "you're welcome," "happy to oblige," I mean it's just awkward. Thanking AFTER the fact I can handle, but DURING? To this day I'm at a loss for an appropriate response ...
All I could think was, "Dear Lord, please make this man pop in a hurry so I can get the hell out of here and I swear I'll never do this again."
So there you have it, my experience of a bad orgasm. Overall, I'd take the girl who's saying "f*ck me" while she ISN'T being f*cked over my "thank you" guy.
(The one good thing to come out of this experience, about 10 years after the fact or so I told this story to my mother. She laughed so hard, for so long, that she nearly drove off the road and was wiping tears from her eyes for over 10 minutes. It was the "thank you, thank you" that did her in.) That might sound weird to some of you, but my mom and I had always been close, and after I married and had a kid we really were best friends.