Second, It's not "unambiguous;" it is "ambiguous."
It is a congenital defect. There have been ZERO congenital defects or missing X or Y chromosomes in homosexuals. Otherwise, you can be ABSOLUTELY CERTAIN that that discovery would have been trumpeted from every molehill in America.
"Certainly, humans are born with a number of abnormalities. One of these is called intersex which is found in an extremely rare fraction of one-per-cent of all babies. These have female organs, wombs and go through menstrual cycles, yet they have an oversized clitoris, which can grow to resemble a tiny penis. But normal girls have a set of XX chromosomes and normal men have a set of XY chromosomes. Babies born with a set of XO chromosomes are girls with Turners Syndrome. Those born with a set of XXY are boys with Klinefelters Syndrome. Science says a Y chromosome is essential for male development. Therefore, it is possible to say those with the Y chromosome are men. Those without the Y chromosome are women, despite confusing physical abnormalities.
You're talking about a macron accent.
¯ as opposed to _