Circle jerks must be an American thing. Never heard about it before reading the book
I wonder. I'd have guessed it would be (in some form, at least) more universal. But what do I know?
Perhaps this could be the topic of a book. Perhaps titled The American Circle Jerk: History, Future, and Sociological Implications.
I first heard of the idea in the early 2000s, when I was reading about masturbation.. I've never had the opportunity in participating in one.

