I don't love fighting over these sorts of things, especially on Hacker News. So I am not trying to fight at all. But I am genuinely and honestly asking, where do I find research to say that not "only women have cervices"?

After Googling for a few minutes I have found quite a bit of research on how cervical health of a female sexual partner can affect the male partner. I have found how male sexual partner health related to HPV can effect the female cervix. I have found information on how trans-men need to continue to have their cervix tested for medical issues. I haven't found any information on if chromosomal issues can cause cervices to be present in men.

Or is your point that trans-men have cervices and so not "only women have cervices"? If that is the argument you are making, that is fine. Though then I am not sure what you are arguing. But I will just accept your opinion if that is what it is.

It's not an opinion: that's the whole point. This is basic, "there exists X which is Y, therefore not all X is not-Y" logic.

I find your framing device unnecessarily obtuse. Do all women have cervixes? No. Do all non-women lack cervixes? Also no. It's that simple.

You know, I'm trying to steer this towards a conversation. I guess I missed the mark. But I am undeterred. I will still try to pull something educational out for myself.

According to the knowledge I have humans born with two X chromosomes have a cervix unless they have a generic abnormality or have a surgical procedure to remove the cervix. Humans born with an X and Y chromosome do not have a cervix. There may be humans born with different chromosome arrangements that do have a cervix, but I can't find a lot of, or any, medical research on such. If there is, I would like to read about it. That's what I'm asking.

Again, according to my knowledge, humans can designate themselves with whatever noun (woman, man) and pronoun (he, she, it, etc) they wish. That means that humans who designate themselves as man can have a cervix because they picked the designation and that designation does not designate a set of reproductive organs.

Education is not obtuse. Language had become complicated. Social norms have become complicated. I'm trying to actually get an understanding from various sources.

That’s correct, there’s nothing surprising going on here biologically, it’s purely about the definition of the words ‘man’ and ‘woman’.