Wow, he had that thing in far enough to go all the away around the large intestine (up from the ass, across the top, and down to where the appendix is) Notice how he gently guided the thing in like a doctor examines the colon. And, the dildo is extremely flexible so it could follow the path. Any sudden pushing would rupture the colon and require emergency surgery or cause death. He's very experienced and this obviously wasn't his first try. It does feel very good -- takes a lot of tolerance to pain to do, a lot of lube, and is extremely dangerous.