No really this is nonsense on stilts! Males and female populations overlap on lots of axes (shoe size for example). But shoe size is not how we identify the sexes.https://twitter.com/josh_t_dean/status/1045684301885575169 …
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The axes are supposed to represent an index of typically "female" sex traits (well the first one; the second is just an illustration of a histogram). Point is that "number of penises" is an arbitrary choice among a multitude of biological factors that cluster together.
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No it is really not arbitrary at all. Every person that ever lived developed from two gametes. One large, one small. The large one came from a person without a penis. A person with no penis gestate and gave birth . The small gamete came from a person with a penis.
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