This guy truly rams his fist in his rectum and works it like he's in a fist fight...
This video is the real deal, a homemade video of a guy at home having a real intense self-love, self-fuck session. Turn the sound up, you can hear him sending his fist into his rectum and no doubt slugging his prostate. And as violently as he is pounding his fist in his rectum, be aware that he is well lubed. If he has any thin tissue issues as some sites warn about, we don't see any evidence at all of bleeding...
He has other vids, but there's nothing like this one, which lasts a little over 9 minutes.