Bateman's principle is a debunked idea in early evolutionary biology that males reproduce less than females due to universal social roles and psychology that are akin to a law of nature. The idea was based on the study of fruit flies and evolutionary psychology.
Research of different human populations have shown that in societies such as pre-industrial Finland and Norway, as well as polygynous societies such as the Yomut Turkmen of Iran, the males have less, or about even reproductive success variance as compared to women
Further research has shown that female choosiness is not an unchangeable psychological force, but rather mostly contextual to changeable demographics, such as the ratio of sexually available women to men, variation in perceived male quality, and societal determinants of breeding cost to females, such as social parental investment roles.
Despite the fact that the vast majority of societies saw greater male reproductive success variance than women, the fact that societies have existed at all that do not conform to this, more or less rules out the 'law of nature' claim. Particularly to the extent a state may want to emulate how those societies with small male RS success variance through cultural engineering.
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