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You were making a general statement about biological sex in nature:

This does not conform with our current understanding of biology.

Yes, it absolutely does.  No biologist defines humans with Kleinfelter's Syndrome (one of the conditions you're talking about) as a third biological sex.  We're not talking about sea cucumbers, here, we're talking about mammals, which have two biological sexes.  Again, birth abnormalities do not speak to the general characteristics of biological organisms.

Of course not. What they /do/ say is that biological sex is more complicated than simply fitting in a binary structure.

Sigh. Once again, this is what you wrote:

It does matter in how society tries to apply an imperfect, unscientific understanding of biological sex to an imperfect, unscientific understanding of gender identity.

Of course not. What they /do/ say is that biological sex is more complicated than simply fitting in a binary structure.

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Okay, I won't assume you understand what I'm saying.  So, if there are more than two biological sexes, what are the gonad structures associated with these other sexes and how do they interact with male and female gonad structures in reproduction?  What glands do these third and fourth sex humans have that biologically male and female humans don't have?

The tiny minority of birth abnormalities you're alluding to, again, are admixtures of male and female biological structures, usually with one or both elements underdeveloped and non-functional.  It is not a third or fourth set of biological structures.  The same is true, by the way, of plants and animals, some of which can change between male and female structures or manifest both, but there are still only male and female reproductive structures, there is no third or fourth set.

Biological sex structures are produced by evolution for the purpose of reproduction, and reproduction is a binary thing, involving male and female gonad structures.  This is basic biology.

And none of this has anything to do with transgender people, because once again, intersexed people and transgender people are, for the most part, not the same people.  And please, spare us all your plaintive sighing.

Taking the binary format and throwing in a third or fourth or fifth entirely misses the point and is a straw man.

Straaaaaaawman.

Yes. This is correct. Gonad structures are binary.

Using gonads to define biological sexes, however, results in ambiguity. Using chromosomes to define biological sexes results in ambiguity. Using hormones to define biological sexes results in ambiguity. Using genes to define biological sexes results in ambiguity. Using secondary sexual characteristics to define biological sexes results in ambiguity.

Which is why biologists say that sex is not binary and exists on a spectrum. You act like I'm making all this shit up and it's not the current conversation in the scientific community. Pick up a journal.

Once again, an imperfect, unscientific understanding of biological sex leads to an imperfect, unscientific understanding of gender identity. I mean, it's the foundation of every claim that transgenderism doesn't exist that I've ever seen. "God made only two sexes..."