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JestAJester says
. The only exception maybe is that there are people with mutations that have given them a mix up of X and Y chromosomes but they are a tiny tiny percentage of the populace.
Yeah, but they are people and they are citizens and they don't fall into either category.
Also, chromosomes make up the genotype, and a few genotypes are neither XX nor XY. Sex organs help determine the phenotype, and some people are born with a range from no functioning sex organs to varying amounts of male & female sex organs on the same individual (these are often called intersex; sometimes hermaphrodite).
But there's one other sex organ we've left out.
The Brain. And it's far and away the most complex sex organ of all. So when someone says they've felt female for the past sixty years, who are we to deny those decades of their life???