[Svartalfiar]

Of course! Yet they exist, so now what?

You just want to act like they don’t exist?

What would you classify their sex as? Male or female?

True hermaphrodites are extremely rare, less than a thousand documented cases. Ever.

Otherwise, almost every person can be categorized male or female based on the presence of the Y. Yes Y = male, no Y = female. Most chromosomal deficiences don't affect sex, but those that do, are definitively male or female. XYY, male. X or XXX, female. They may have ambiguous presentation or some cross-sex characteristics, but they are still specifically male or female.

Exceptions are some mutations where a male will have some cells drop the Y chromosome, but this is different from Turner's, and they're still male. Or, chimeras, where a second fetus of opposite sex was absorbed into the first, resulting in a mix of XX and XY cells, although normally one or the other is dominant. But again, very rare occurrences. None of these are something with tens of millions of people out there.

[WarANDPiece]

That’s a lot of words to say “yes they exist, but not enough for the government to waste any time adding a third option.”

They do exist, but not as far as systems of classifications go.