Although not an overnight change, I remember the TV programme about a Caribbean Island, where some are born appearing to be female, but later on physically change to male. I think there's a Pacific Island with the same genetic fault.
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Like the other Guevedoces, Johnny was brought up as a girl because he had no visible testes or penis and what appeared to be a vagina. It is only when he approached puberty that his penis grew and testicles descended.
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