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@Reece101
That is a very uncharitable interpretation of what I am saying. I used those as examples as they are the easiest to imagine (and see why your bimodal model doesn't work).
Gametes (and the 'plumbing') are primary, secondary would be other traits like secondary sex characteristics, and tertiary would be characteristics like height differences, average body temperature differences, etc.
More variation exists in tertiary traits than secondary, which has more variation than in primary. There is literally zero dispute on this in biology and the philosophy of biology when it comes to non-human species, why is it such an issue the moment we treat humans the same?
Also, you are the one advocating for a bimodal model, so what, precisely, would you use as a definition about what constitutes a mana and a woman then? What are the traits that are on a spectrum if you want to take issue with the examples of traits on a bimodal spectrum that I gave?