One of the Kabbalah secrets revealed. These people are transformed in utero. By the eighth week of pregnancy, the genitalia have not been formed yet, so they inject the opposite hormone (a blood test will reveal if there's testosterone presence in the mother's blood) into the womb.
The result is that the external part of the body is formed according to the hormone being injected. So A boy will be born, with the skeleton of a woman, with a penis, but he'll have to take external testosterone for the rest of his life.
Conversely, if estrogen is injected, the boy will be born with a vagina but will not be able to have kids, since they cannot pass through the narrow cavity in the pelvis. Old school transformers, would just chop the testes of a boy or give the mother testosterone from animals in order to change the girl. That is their secret. It happens in nature by accident. Google what is a “freemartin".
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