I've done it in real life a couple of times. It requires a LOT of foreplay and have to be really slow. One guy had tiny hands and it was interesting but nothing to write home about. The other guy had big hands and once he finally got all the way in it was really really uncomfortable, almost nauseating. I think if you want to do it, should probably look up the best way, and which way your hand should be facing so you aren't poking at stuff inside that doesn't like to be poked.