The testosterone test:
This was part of an approach that allows men to transition to women; except they had to suppress their testosterone level.
The problem is once children pass through puberty, it’s too late to reverse the effects. The males jump from about equal to female in height, strength, etc., to taller, stronger, etc.
Furthermore, trans athletes learned to manipulate the testosterone test. For example, lower testosterone right before testing.
The simpler way is to test for XY chromosomes. I don’t have an advanced degree in biology, but sex is determined by a person’s chromosomes and ALL advanced animals are dimorphic; many much more than we humans.
As for the very few XXY, 0.1 of 1 percent. so called inter-sex, they’re males; but, I’d be o.k. with handling them on a case by case basis.
Yeah, this reportedly an unusual genetic defect case...(female pelvic area/no gonads) see my post here:
https://freerepublic.com/focus/news/4255570/posts?page=145#145