Gay men are still men. Gay women are still women.The constitution doesn't define anyone as "real" men or women. Are you saying gay people aren't real?
There's no reason it should—no reason there ought to be any need to do so. Since long before the Constitution was written, since long before the United States was founded, since long before Europeans even knew about this continent; people knew the difference between men and women, knew the biological function of the two separate sexes, and understood the purpose of marriage within the context of that biological function.
That our modern society has lately become infested with mental- and moral-defectives, who either deny, or perhaps sincerely do not understand these important distinctions, is not an issue that the authors of the Constitution could have anticipated, nor is the Constitution an instrument by which this issue could reasonably be addressed. These are psychiatric issues, and moral issues, not political issues.
It is a dire mistake for society to demand or expect or even tolerate that our legal system should be corrupted in order to treat madness as equal to sanity, perversion as equal to decency, or evil as equal to good.
Not really, some do not identify with their gender, but that is because you are not well educated on this subject, you just run debunked far left narratives.