What is Fisting?

Fisting, handballing, fist-fucking, brachiovaginal, or brachioproctic insertion is a sexual activity that involves inserting a hand into the vagina or rectum. Once insertion is complete, the fingers either naturally clench into a fist or remain straight. In more vigorous forms of fisting, such as "punching / punchfisting ", a fully clenched fist may be inserted and withdrawn slowly. Fisting may be performed with or without a partner.
The "Silent Duck", also called "Duck-Billing", is the technique much often used in which the person engaging in hand insertion shapes the hand to resemble a duck's beak. Typically, fisting does not involve forcing the clenched fist into the vagina or rectum. Instead, all five fingers are kept straight and held as close together as possible (forming the beak-like "duck"), then slowly inserted into a well lubricated vagina or rectum.
Fistees who are more experienced may take two fists (double-fisting) in the vagina or rectum. In the case of double-fisting, pleasure is derived more from the stretching of the anus or vagina than from the thrusting (in-and-out) movement of hands.
For anal fisting a lubricant is typically used.