Other ppl are giving you a hard time but maybe I can help. We were taught in PHYS 6969 the law of conservation of gender. Similar to conservation of charge, given a population, there will always be a net 0 gender. You’re probably familiar with how the electric force has two charges, positive and negative, but the strong force has three charges, red green and blue (look up QCD for more info). And, for conservation of charge within the strong field, if a charge, let’s say blue, is created within a volume, then there must also be created red and green to preserve charge conservation (ignoring here non-analogous charge anti-charge pair creation).

Now, because the population increases stepwise by ones, and because gender is a conserved quantity, the number of genders has to change as well. When there were 10 ppl, there were 2 genders, per gender conservation. But when there were 11 ppl, because 11 is a prime number, there must have also been 11 genders for gender conservation to hold. And since the population is now by rough estimates over 7.5 billion, that means it at one point it must have been at 7500000031, which is a prime number.

So, at one point in human history, by gender conservation, there were 7500000031 genders, which we can take as a conservative maximum. The minimum of course must be 0 genders as when there was only 1 person in the population, that person must have had no gender to preserve gender conservation. So far as I know, that’s Cornell’s official stance.