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.
This can be seen as the inverse of the donkey punch.
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.