@rcz @darnell I'm glad we agree that how invasive the tests are should be taken into account.
You also said that in your opinion there a set of tests that can be performed to clearly and unambiguously establish whether any given person is "male" or "female".
In that case: is it possible that some people that based on that set of tests are considered "female" would still have muscle mass and strength and bone density, higher than some people who based on that set of tests are considered "male"?