During sexual intercourse, you place a plastic bag over your lovers face and punch them repeatedly (can also be accomplished with a hammer for authenticity). Make sure the bag has holes to ensure access to oxygen.
Jody: WOW! Sarah, where did you get all those bruises?
Sarah: Oh, last night was Joe's birthday, so while we were in bed I let him give me the beef carpaccio.
Jody: You guys are really in love, huh?
Sarah: We are.