Fisting

Fisting is a sexual technique where multiple fingers and sometimes the whole hand is inserted the vagina or anus. This is done in different ways. With punch, the fist is punched into the opening in one go after extensive preparation.
The use of a lubricant is necessary for anal use. Some claim that the recipient has a very intense sexual experience with an intense orgasm. But for most people this hurts and it is just not possible.