I'd have been afraid to try, but I once had a lover who began fingering me. It felt better and better. At some point I reached down trying to see what he had in me, but he pushed my hand away. Until... I had been completely been going out of my mind for a little while. I "cooled off" a bit. I wanted to know. He let me feel that he had his WHOLE HAND inside of me.

FWIW, he had small to medium hands for a man.