Yep! Been there.
Which is why after I fuck 'em doggy, I don't go down for a minute or two, after getting it in the chops a fwe times you get fed up with it, unless its a long term relationship which is different.
Incidently, any of you ever do it rodeo-style?
"What's that?", I hear you ask.
Well, you start off like the normal doggy style, then when she really gets going, you know.. when their ass takes on a life of its own, you say really loud somehting like.."Shit, this is fucking great baby, keep it going, by the way.. did you know your sister likes it this way too!"
Then see how long you can stay up there for partner!!
YEEHAAAA!!! RIDE 'EM COWBOY!!!