How is shoulder-deep fisting biologically possible?
This question is to those of you who are into extreme porn. So I just saw a video of a guy fisting another guy all the way up to his shoulder on Twitter. He pulled it out in the end too, so he wasn't an amputee or anything. I searched the web and saw that this is actually a thing that people do. I just wanna know how that's biologically possible. Like, how do their intestines not tear? How does that even work?
P.S.: Sorry for ruining your day if you never knew about this and decided to Google it.