Pink boxing is a slang term for anal fisting. The term, generally, is used to refer to fisting a female anus.
More About Pink Boxing
Inserting a fist into the anus of a female is referred to as pink boxing. The term originates from the look of the action, as the whole fist is used, and the flesh around the anus is a pink fleshy color. The term is used frequently by escorts and other sex-trade workers.
