Chromosomes never lie!
You have just opened up a huge business opportunity for some American entrepreneur. While people are doing “background checks” on their latest flame, they should also request that their flame submit to a DNA test to determine their sex.
Careful pinning too much on chromosomes. It’s rare, but you might read about complete androgen insensitivity syndrome.
That condition (along with other endocrine anomalies) is why I am always careful to limit my condemnation of “trangenderism” as being a delusion to those with normal sex chromosome and corresponding primary sexual characteristics who think, or insist, that they are the opposite sex.