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I don't think I'm reaching. Read the comments below, about the fact that children learn this spine-bend posture early on, way before any sedentary lifestyle. I'm pretty sure 3-year-olds aren't using washing machines either.

I'm speaking from firsthand personal experience, and overwhelming experience seeing others go through the same cultural conditioning I described in my post.

How is 3 years old "way before any sedentary lifestyle"? I consider my family moderately active, but my 3 year old is certainly familiar with the couch. In more agrarian societies, there are probably a lot fewer opportunities to sit somewhere comfortably.

And did you consider agrarian but sexually-conservative regions (maybe India or the Middle East?), or developed but sexually-liberal regions (maybe Mediterranean?), to see if those line up with your theory?

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