Austin rules.
Most know the EMP catalogue, they sell metal shirts and they also sell these blow up sheep "with backdoor".
I didn't know what a rubber fist is, so I googled it and came up with this picture:
Is this the one?
That's exactly what it is. I put my fist up next to it, it's reall life size. Of course, anytime you can do a side by side comparison at a smut shop, makes you fell pretty special, doncha think?