Fisting, or the practice of inserting a fist into the vagina (for those with a vulva) or anus (for those with a rectum), is a form of penetrative sex that involves the entire hand. Like many sexual practices, its origins are not well-documented, and it's practiced in various forms across different cultures. In some Asian cultures, as in many others around the world, fisting and other forms of sexual exploration are viewed through the lens of personal freedom, intimacy, and sexual health.