So jokes share much with sex even when they're not sex jokes. An instinct to focus on supernormal stimuli would also help explain the fascination with over size

So jokes share much with sex even when they're not sex jokes. An instinct to focus on supernormal stimuli would also help explain the fascination with over sized and contrasting genitalia, makeup to exaggerate signals of arousal, various modes of sexual harassment, etc. They're variations on Tinbergen’s stickleback mandible spots.