I once saw a big rubber fist in a porn store, that had me laughing out loud for like ten minutes. The whole time I kept thinking, why would anyone need a rubber fist? When are your own fists just not going to be enough? How many guys have had their fists up a girl and had her say, it's just not enough, I still feel some gaps in there, do you have a third fist perhaps?
On the other hand, I held my arm up to it and matched up almost exactly, which well, made me feel pretty proud. Cuz anytime you can match up to anything in a smut shop, you should feel pretty good.