Is aversion to discussion of sex a part of traditional Chinese culture? Seems odd given I'm not aware of any puritanical religions taking hold there.
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Because it promotes social stability ? As much as I dislike defending religion - those values produced the most stable societies through history
I don’t actually think the answers to these questions disprove your statement, because I have a painful lack of knowledge as to what those answers actually are. But I do feel that those answers need to be given before an argument such as yours can make sense.
(Granted, a trait that promotes societal stability can become common even if stability isn’t actually good, so the last question is not as important as the others. A dystopian equilibrium is still an equilibrium.)