A recent observation about the teenage species:
My son’s two friends who are girls came over, and they all watched a scary movie together. My couch is basically a large, two-couch sectional. The three kids, however, sat right up next to each other, like birds on a wire.
A little later the girls went home and two boys replaced them. The three boys were in the living room also watching a movie, but they were each on a separate piece of furniture, as far away from each other as they could be without being in another room.
I think somehow this is all related to women going to the bathroom together and men going to movies together but leaving an empty seat between them. I’ve got a call in to Jane Goodall to offer my living room as a lab for her studies.