Just in case you’re thick a Youtube commenter expertly explains the donkey part (very well put, I might add): “This plays on differences between men and women about what they are looking for in sexual relations. A man wants pleasure, a woman wants emotional support. So, the punch line of the joke is a “sex worker” who deals with men’s needs all day wants the animal–a fixture in raunchy sex shows because it has a big “member”–to give emotional support. It is cliche that many women just want to be held, but typically not the “sex worker” women. That is … the punch line of the joke.”
