I have seen a number of gay fisting videos where guys take an arm up almost to the other one's shoulder. I have always wondered how the intestines could accommodate an arm, but I know that it is real. I'm sure if you go to the web links area of this board, you will find a fisting video that will support this. As for fake videos of women taking a human head inside her pussy or ass, that's a different story.Will somebody with some knowledge of human anatomy please chip in? I don't think any human rectum stretches up to 9 or 10" as claimed by some here. That would pierce the colon and lower intestines. I'd say 5 or 6" max is a more reasonable depth.