Fisting porn
Fisting in porn videos involves an incredible extreme, which you can't prepare for very easily. Any woman who wants to do it with a man or another woman will face very serious difficulties. First of all, she will be offered a thorough stretching of the holes, after which it will not be extremely easy to sink into a state of euphoria. The vagina, for example, is capable of stretching so long that it becomes a truly bottomless hole. But with the anus you can't do that trick, because it's extremely narrow and can't become huge by definition.
