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Sex and culture by Joseph Unwin https://www.amazon.com.au/Sex-Culture-Joseph-Daniel-Unwin/dp/1979867046
He studied 80 different nations and 6 civilizations throughout history, examined their individual rises and falls, and concluded that the causes of their falls were largely...
I recently emailed Ray to ask his opinion on a metabolic view of dating, with a specific emphasis on the amount of partners involved. He responded and figured it was a gem that others would appreciate.