Sure it does, it's the sex you have biologically. The second thing you're talking about is called gender-affirming care and is distinct from biological sex. Both "sex" and "gender" are societal concepts, but sex is descriptive whereas gender is prescriptive. You can read that to mean sex is scientifically determinable, whereas gender is meaninglessly abstract. Sex says, "assuming all your bits work, here's how you would contribute to the reproductive process." Gender says, "regardless of what bits you were born with but dependent on what bits people think you were born with, here's how society will treat you and expect you to behave." "Biological gender" doesn't exist, just like "sociological sex" doesn't exist. So I guess in that sense, "biological sex" doesn't make sense, because there's no other kind.

Edit: got banned from an entire separate community (an unthemed meme community no less lol) for this discussion because they thought I was transphobic 🤣🤦‍♂️🤷‍♂️ Sorry for the misunderstanding, I'll just stay out of it next time 👍🤣

Besides, a lot of cis women can't get pregnant either, and it covers the case of trans men who can.

You don't realize that's actually more reason to ask about biological sex? If a cis woman can't get pregnant, but she still has ovaries, and all the form asks is "can you get pregnant," then that leaves out important information, such as "I have ovaries and should be screened for ovarian cancer."

A field for "sex" (whether "biological" or "birth" or "assigned" or anything else) very much does provide relevant information, and just because there's additional information that may be relevant (such as hormones and surgeries) doesn't negate that.

And I never said it should be binary. That's an assumption you're making about what point I'm trying to make. I've never denied the existence of intersex people, and in fact I even mentioned how a person being intersex is relevant information for their doctor to know that isn't covered by gender or "can you get pregnant?"

I've heard it described as "trans broken arm syndrome".

Medical professionals dismissing people's concerns is a completely separate issue from needing to know basic information about their bodies.

And by the way, even as an ostensibly cis man, I've regularly had my concerns dismissed by doctors too. It's almost like when you never stop to ask someone what kinds of issues they face, you don't realize that some of the issues you face, they face too.

This assumption that "cis men just automatically get all the medical treatment they need" is based in the fact that nobody ever stopped to ask cis men if they ever feel dismissed by their doctors. (Oh, and by the way, the cultural stigma that cis men are supposed to avoid the doctor because they need to be manly and strong might also have something to do with it, since most men avoid going to the doctor until there's no doubt that something is absolutely wrong. As someone who finds that to be bullshit, and has gone to the doctor with a variety of concerns that get dismissed, I can tell you that dismissive doctors is endemic to the medical profession, and that cis men aren't just magically immune to it).

A single binary "biological sex"
...
If you want to argue that this can be packaged into a nice little binary

I never said anything about sex being binary, so your fixation on making this about binaries is a strawman.

Finally, your persistent sealioning only contributes to the problem that no one ever fucking listens to trans people.

I'm not sealioning. I've listened to what people are saying, but just because I've listened to something doesn't mean I can't disagree with it. And since nobody has actually come up with a response to what I've said and have chosen instead to rely on thought-stopping accusations of transphobia and strawman arguments such as misrepresenting this as being about binaries or about toilets, then it seems I'm the one not being listened to. Do you realize how difficult it is to maintain a good-faith discussion with someone who wilfully misses the point?

You have easily typed out more than any trans person in the conversation and have learned absolutely nothing from it.

Why should I have to learn from anyone who's responding to points I didn't make? People make assumptions about me and mischaracterize what I'm saying. What is there to learn from that?

I've asked what terminology you prefer. I've asked what a medical form should ask instead of "biological sex." But nobody responds to that because they want to dismiss it all as transphobia. There's not much to learn from that.

And just because I'm on the spectrum and don't know how to be concise while still getting my point across doesn't mean a thing.