off the top of my head I remember porn, flashing, licentious conversation,
and inappropriate physical contact between some boys and a friend's teenage sister. This was at a handful of slumber parties between the ages of 10 and 12, several decades ago. These weren't a bunch of bad kids from broken families, they were regular kids from regular families. So when people talk about the potential evils in those settings, I do not consider them prudes or overprotective. They are realists.