Sexual dimorphism is the distinct differences between the sexes within a species. A species with high sexual dimorphism has very noticeable difference between e.g. males and females. For example, the irish elk had such high sexual dimorphism that it led to the extinction of the species, a process called fisherian runaway.
Otto Weininger argued that in humans, the less sexually dimorphic the genders, the less of a problem female sexual liberation becomes. Whereas, if there is high sexual dimorphism in humans, female sexual liberation leads to agitation, domestic abuse against husbands, and corruption of the arts and science by feminine women only expressing vanity and seeking male attention.
The famous MRA Warren Farrell argued that in humans sexual dimorphism could lead to a fisherian runaway and extinction of the species if females continue to select for, "killer-hunter", type men with the advent of nuclear technology.
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