Even biological sex is more complicated than just 2 gametes. There are cis-men with XX chromosomes do to a mutation in one of the Xs, there are cis-women with XY due to a myriad of mutations, there are intersex people due to everything from random mutations to chimerism, etc.
That’s confusing how sex is defined with how sex is determined. See the linked thread for a lot of this discussion, but you’re talking about variations within the sex binary. Intersex people aren’t in conflict with the sex binary, because they’re either male or female with Disorders of sex development.
Even biological sex is more complicated than just 2 gametes. There are cis-men with XX chromosomes do to a mutation in one of the Xs, there are cis-women with XY due to a myriad of mutations, there are intersex people due to everything from random mutations to chimerism, etc.
If we put aside humans for a moment, some species of animal have more than binary sexes. Some species of mushroom have thousands, for example.
Those actually aren’t sexes, those are mating types. The difference is that all of their gametes are approximately the same size, i.e. isogamy.
That’s confusing how sex is defined with how sex is determined. See the linked thread for a lot of this discussion, but you’re talking about variations within the sex binary. Intersex people aren’t in conflict with the sex binary, because they’re either male or female with Disorders of sex development.