ETA: There is now a third thread, so send new comments there.
Since the first thread has exceeded 500 comments, it seems time for a new one, with Eliezer's just-posted Chapter 33 & 34 to kick things off.
From previous post:
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.
Boarding schools and prisons create similar social scenarios. I believe male-male rape/harassment/"hazing" is/was a significant problem in many all-male British boarding schools.
Fraternities fit into more or less the same category, and likewise frequently feature various forms of ritualized homosexuality. It just isn't considered acceptable to acknowledge this; being the receptive partner in gay male sex has been considered damaging to masculinity for thousands of years, in at least the West and Japan.