Gay Fisting is a type of hardcore, intense sex act that involves one partner inserting their entire fist and sometimes even more into the other's anus or vagina. This type of sex act is considered to be one of the most extreme types of play and should not be attempted without proper preparation, instruction, and the use of appropriate safety precautions. Gay Fisting can bring about intense sexual pleasure for both partners, but it should be undertaken with caution and respect.