It’s easy to understand why a parent might react harshly to the news that their son is experimenting in this way at school. In a culture that thrusts adult sexuality onto children — ones who are often too young to understand it — it makes sense that people are freaked out by one child putting their mouth on another’s genitals. Yes, it’s more intimate than the basic poke-n-touch. Do preschoolers know that? Not really. They’re just fumbling around.