The vast majority of fauna have two sexes. Why aren’t more animals hermaphrodites?
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I’m not an expert, but pretty confident in my answer. As life evolved the advantage of two separate sub-categories (sexes) within different categories of life forms (species) became apparent, because greater genetic variability within a population increased their chance for survival and sexual reproduction allowed for the combination of very different genomes, unlike with self-cloning, as for example genderless bacteria do. Once there’s two types of one organism that need eachother to reproduce, it’s then even more advantageous for survival if they have different qualities that compliment eachother, male and female specialised in their own role with regard to raising and protecting their offspring. Pretty sure that’s why all more advanced life forms evolved to have two differing sexes.
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