At last: New Yorker cartoons explained

The New Yorker is famous, among many other things, for the intellectual density of its cartoons. That's why there's a New Yorker cartoon anti-caption contest. It's not famous for self-mockery. So it's heartening to see, in the annual cartoon issue, an "IQ test" consisting of five of the most enigmatic examples, each with four possible explanations. Why is one electrical plug shouting "Marsha!" to another? According to the answer sheet: "Using a metaphor, this cartoon shows how funny it is that human sexual intercourse can often feel as cold and mechanical as the transfer of AC electricity from a socket to a plug." Stop it, Monkey's sides are splitting.