Two gamete types = two sexes.

Sex is a duality, a pair. In other words, a binary.

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"An organism’s sex is defined as the type of gamete their reproductive anatomy is organized to produce:

Male bodies develop towards the production of small gametes (sperm), whereas female bodies develop towards the production of large gametes (ova)."

Because there are no intermediate gametes between sperm and eggs (such as the often joked about sperg or speggs), there are therefore only two sexes. In humans, this sexual dimorphism is so consistent that 99.98% of births are unambiguously male or female.

As developmental biologist Dr. Emma Hilton and evolutionary biologist Dr. Colin Wright note, “The evolutionary function of these two anatomies is to aid in reproduction via the fusion of sperm and ova...

No third type of sex cell exists in humans, and therefore there is no sex ‘spectrum’ or additional sexes beyond male and female. Sex is binary.”

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