Fisting is a sexual practice that involves inserting a hand or fist into the vagina or rectum for sexual stimulation. It is considered a form of penetrative sex and can involve varying levels of intensity and depth. Fisting requires trust, communication, and preparation between partners to ensure safety and comfort. It is important for participants to use adequate lubrication and engage in gradual progression to minimize the risk of injury. Consent, communication, and mutual understanding are essential aspects of engaging in fisting or any other sexual activity.