Yes. And I can wait.
Tick tock.
Biological sex in humans is determined by:
1. Chromosomes (XX vs. XY, with very rare variation such as XYY, XXX, etc. --but there is NO XYZ)
2. Genitalia
3. Reproductive system
4. Muscular-skeletal differences: women have a differently-shaped, wider pelvis. Men have more bone development at muscle attachment sites, etc.
5. Hormonal differences (testosterone vs. estrogen, etc.)
Even in the instance where a person is born with malformed genitalia, or an extra chromosome, that does NOT make them "non-binary", nor does it constitute a third sex. The determination of sex is based on the aggregate of the criteria above, not simply "does the baby have a penis"?
on a more fundamental level:
"An organism's sex is defined by the type of gamete (sperm or ova) it has the function of producing. Males have the function of producing sperm, or small gametes; females, ova, or large ones.
Because there is no third gamete type, there are only two sexes. Sex is binary"
If Caitlin Jenner commits a murder, and the police gather up DNA evidence, it will show that a male committed the crime, despite the fact Bruce Jenner transitioned to female, had surgery, took hormones, etc. And it doesn't matter whose DNA is gathered up --the result is either male or female. There is no "third" option.
Activists like to say that because there can be "intersex variation" that sex is not binary, but this is complete nonsense, and it isn't how we classify things biologically.
Humans are bi-lateral creatures (two arms, two legs). If a baby is born with an extra leg, or missing a limb, we don't go back and correct every biology textbook and paper to say humans are NOT bilateral. That isn't how it works
There is no example of a legitimately third sex anywhere in history among humans (XYZ chromosomes, able to produce offspring on its own, etc.), and sex is therefore binary.
Note: I am talking about biological sex, not "gender" (which is conflated with sex)
a nice essay on this whole topic, and one which debunks some of the nonsense you find on the web, is this one: