First of all, we start with a declaration that there are only two sexes *because* there are only two kinds of gametes.
Transphobes start from this premise because all other sex-related biological characteristics (anatomy, genetics) have various expressions that lie on a continuum.
Transphobes start from this premise because all other sex-related biological characteristics (anatomy, genetics) have various expressions that lie on a continuum.
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Many people don't produce gametes.
It's clear that the idea is to impose a binary classification, but even if "sex" is reductively defined in terms of gamete production alone, that doesn't mandate a binary model...
https://philarchive.org/rec/GRIWAB-2
For example, androgen insensitivity can result in a variety of anatomies that range between (typical) male and female types.
You can see what this means in this description of the "Quigley scale"
https://en.wikipedia.org/wiki/Quigley_scale
The definition falls apart on this basis alone. But also on other grounds.
"You're male, because your body was designed to produce small gametes. We know that your body was designed to produce small gametes because you're male ".
Sigh.
Finally, in technical terms, polar bodies in egg cells are small gametes (but not as small as sperm), and unfertilised mammalian egg cells aren’t actually gametes (they are oocytes).
- transphobes, probably