Erotic film. 80…90s.

Perhaps France or American.
Perhaps one of Emmanuelle films.
Only one scene.
Private erotic party. There are the guests around the table. They are men and women.
Some erotic action is on that table. Everybody watch that action.
But unexpected huge black-skin man catches a young woman. Somebody steps to him,
but black-skin man shows the knife and everybody step back.
Black-skin man slits the back of women’s jeans and begins to fack her in her ass.