Rodeo Sex - the thrill of fucking a bucking girl

Most people think of this as a joke, but try it - it's great if you can handle it.
The concept is fairly simple. You start to fuck your naked partner in the doggy position. Once your under way, you reach under her and grasp her breasts.
You then say "great breasts, they're just like your sisters". The thrill comes from trying to hang on until you cum.