Yes, it's happened to me.
"Your times almost up and the owner gets mad if I go over" Meanwhile, you have known the owner for quite a time and you KNOW that he won't care less.
But usually, it's the women who are shit at the job anyway and have NO CLUE how to please a man. They figure the old jack hammer routine is what works best. (It's all they know anyway, and all they ever will know.)
For me, if I feel like the MP is more on the sensual / erotic / nasty side and seems to really have a "feel" on how to take care of a cock, I'm good to go ever time. But a chick who has slammed the brakes on so many times during the session that she's worn the pads out, there is nothing to help bring me off. I usually just close my eyes and try to think of some hot experience I had in the civilian world.
That's the beauty of this forum is it allows you to separate the wheat from the chaff because frankly, there's a lot more chaff than wheat.