I got no idea lol it never appealed to me anyway so I never found out
For the sake of spreading human anatomy basics (and preventing misconceptions all over) - there a things that WILL work. Then there's things, that MIGHT work. And lastly, there are some particular things, that only work if its an endoscope, you see.
http://www.mangago.zone/home/photo/3410324/
(As a former nurse, whenever I see some anatomically questionable practices promoted I can't help but hear Peter Quill:
"Let's talk about this plan of yours. I think it's good except it sucks.")
Lol it was a rhetorical question, I know that there’s obviously safe ways to have anal sex, even if I don’t know the details. I think it’s really cool that you have this knowledge and are willing to inform others, because yeah, manga really glosses it over and pretends none of that matters!
There’s gotta be a way to put it all in safely, right...? Otherwise how does fisting work