I can&#x27;t help but wonder if this is a case of correlation != causation.<p>I&#x27;m thinking particularly because the focus is on patriarchal, unequal and heavily stratified societies. That makes me wonder if it would make for a different study if it compared with gender neutral polyamorous societies with many-to-many relationships. I&#x27;m not aware that such societies exist in socially significant volumes outside of small groupings though. Still, it smacks a little of Eurocentricism.