I’d be completely on board for a set of terms that boils down to identifying ONLY people who have the relevant gametes to contribute to a fertility clinic.
As I put it in a previous comment, maybe you missed my "magnum opus"?
https://medium.com/@steersmann/reality-and-illusion-being-vs-identifying-as-77f9618b17c7
So, in consequence and relative to which, one might tentatively suggest a couple of hyphenated words — based on Latin for some extra pizzazz — to cover all of those bases, to create a set of exhaustive categories, to name them for some as yet unspecified “adaptive or pragmatic purpose”, to wit: parit-ova (produces ova); sperma-facit (produces sperm); and, for the sake of completeness and to remove any possible “wiggle-room”, nec-non-parit-ova-genituram (produces neither ova nor sperm). In addition, since it is more or less a given that the process of sex is, by definition and by common understanding, fundamental to and itself the process of biological reproduction, we might also assert that those first two categories are or can be called the two sexes by virtue of being the only categories of those able to take part in reproduction.
But if those definitions were adopted, how long do you think it would be before someone came up with a name for "adult human parit-ova"? And laws to segregate people based on membership in those new categories? And before there was a cachet attached to the word that the transloonies would seek to usurp?
But I can tell you firsthand that 99% of everyone does not want ‘male or female’ to be that set of terms, many to the point of deep insult at the suggestion. Even with animals, we call a boy dog whose puppy makers were removed “neutered male,” not “ex-male” or “sexless” etc.
So WHAT if they're "offended"? See Stephen Fry's "pithy" comment thereon, and a quote of Jonathan Rauch:
https://www.goodreads.com/quotes/706825-it-s-now-very-common-to-hear-people-say-i-m-rather
“Those who claim to be hurt by words must be led to expect nothing as compensation. Otherwise, once they learn they can get something by claiming to be hurt, they will go into the business of being offended.”
https://www.goodreads.com/quotes/5539805-those-who-claim-to-be-hurt-by-words-must-be
But see my recent comment on how there might be some marginal justification for phrases like "female child" as long as it's clearly understood that prepubescent children are sexless.
And I’m still in the dark as to its utility. Is it just the first set of terms in a group of many, which will be able to clearly identify various situations of anatomy or behaviour?
The crux of the whole transgender "contretemps

" is that transloonie nutcases and their "useful/useless idiots" are bastardizing and corrupting the language to the point that no one has a clue what anyone means by the terms "sex" and "gender" anymore. See this generally quite good essay on the topic by Andy Lewis at the Quackometer:
https://www.quackometer.net/blog/2021/07/on-the-sex-deracination-gambit.html
The biological definitions for the sexes seem the only way of separating wheat and chaff, drawing a line in the sand, calling a spade an *******!

rolleyes

shovel, letting the chips fall where they may. To coin a phrase or two ...
Sorting out which people have active gametes of whichever type has been the lowest hanging fruit of the Other Issues Going On, for a while, I think. That’s not the complicated part of any question.
Don't think so - sorting out what we mean by "male" and "female" looks like Job One. We can't deal with that "complicated part" if we can't agree on the definitions for those terms, particularly when those parts hinge, unwisely or not, on those definitions.
But somewhat more broadly, a great deal of justification to argue - as I've done - that transgenderism is really only a symptom, not the "disease" itself:
https://randomminds.substack.com/p/a-forbidden-conversation-about-gender/comment/8691460
Some justification to argue, as "biologist" Colin Wright's Substack title suggests, that transgenderism may well constitute "Reality's Last Stand".