[tovej]

The rhetorical claim "there are only two sexes" is only ever used to claim that there are two genders. And that is precisely what Dawkins has done.

You are wrong about intersex people being genetically classifiable. There is no deterministic causal relationship between genetics and sex characteristics: as an example, a person with XX chromosomes may develop external male genitalia and v.v. for XY chromosomes. But of course, for most people with XX and XY chromosomes develop, this is the other way around. See how genetics do not explain this?

[mrec]

Your first para seems utterly bizarre, to the point of nonsensicality. Maybe it would help if you could say what you think "gender" refers to, but at this point I doubt it.

Your second para's argument would only be valid if you thought that sex is defined by external characteristics. I'm pretty sure you don't think that. And as far as I'm aware, while some DSDs certainly have a gene-expression component, there's no reason to think that they don't all ultimately have a genetic basis. There's a strong whiff here of "it's all terribly complicated so let's just agree that nothing means anything".

Obviously people can disagree about the merits or otherwise of a genetic classification. But it's not straightforwardly wrong or insane, particularly since credible alternatives have been notably lacking.

[tovej]

Ok, so you don't know what you're talking about. That's fine.

"There's no reason to think they don't all ultimately have a genetic basis". Oh, so you have groundbreaking research results you want to share? Something that would explain luteoma as having a "genetic basis"?

And yes, external sex characteristics is how sex is determined by doctors at birth. And throughout life. If you live as female/male/ambiguous intersex, but have some other set of chromosomes, that does not change your sex.