I've seen references to studies that imply it's largely a function of social inequality. The more egalitarian a society is, the data seemed to suggest, the more

I've seen references to studies that imply it's largely a function of social inequality. The more egalitarian a society is, the data seemed to suggest, the more likely women were to engage in casual sex with multiple partners. Not sure how that relates to the Denver/Boulder area which I think of as quite capitalist, but maybe there are wrinkles either the studies I saw or the descriptions of Colorado I heard didn't capture.