Who said there was only 2? Its likely that we initially evolved from single celled organisms that reproduced through mitosis and miosis, and then through variations in our DNA actually evolved into our different sexes and species. Then from there it was a genetic evolutionary trait to survive better by forming a pair and we ended up needing two organisms to reproduce rather than just one.
Although I am not a geneticist so the others may have other ideas 🙂
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