I have a couple different kinds. I can have many "mini's".. but you ain't getting more than 1 or maybe 2 big suckers in a night. I'm talking.. rip the headboard off the wall.. sprain your wrist (yep it's happened) kind of things. Quite frankly if someone were capable of making me have more than 1 or 2 of those a night.. i'd run away.
I like those big suckers. My favorite (and slightly sadistic) thing to do was make my vanilla girlfriend have 6 or 8 of those big ones....and then listen to her complain the next day that her stomach muscles hurt. She always complained for a few days, but never once tried to stop me when I started that type of play.