“But if the outdoor plumbing and the chromosomes point the other way, sorry. An XY will never be an XX.”
Ah but what if they dont match
What if are XY but look XX or XX and look XY?
what about XX or XY that got an operation so the apperance no longer matches their genotype (not that it is halkchicly allowed, but say they did it)
what about XO, XXY, XXX, XYY, all of these exist and some are easier to “label” than others. bottom line is it isnt as black and white as some think
what if from the what they are ambiguous and you just cant tell?