Before the release of TDF, the developing foetus has two tiny structures, the mullerian and wolffian ducts, and two small-undifferentiated gonads, neither testes nor ovaries. Without the influence of TDF and testosterone, the gonads form into ovaries and the mullerian duct forms into the female internal sex organs, the wolffian duct disappears and the external sexual tissue becomes the labia major, clitoris, labia minor and clitoral hood. With the influence of TDF, the gonads become testicles and the wolffian duct forms the male internal sex organs, the mullerian ducts dissolve and the external tissue develop into the penis, scrotum, penile sheaths and foreskin. In other words, without testosterone all foetuses develop into females. Adam springs from Eve, not Eve from Adam.

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