"Johnny is known as a 'Guevedoce,' which literally means, 'penis at twelve.'"

"And the reason he’s called that is because, like 1 in 90 of the boys in the area, he first started to grow a penis when he was going through puberty."

Guevedoces are also sometimes called “machihembras” meaning “first a woman, then a man”. When they’re born they look like girls with no testes and what appears to be a vagina. It is only when they near puberty that the penis grows and testicles descend.

Johnny, who is now in his 20s, was once known as Felicita. He was brought up as a girl and remembers going to school in a little red dress. When he was young he would happily play with other little girls, but after the age of seven he started to change. “I did not feel good, I no longer liked to wear a skirt, and I was no longer drawn to play with girls. All I wanted to do is play with toy guns and boys.”...

An endocrinologist explains that Guavadoces are "deficient in an enzyme called 5-α-reductase, which normally converts testosterone into dihydro-testosterone." At puberty, there's such a surge of testosterone that the development that should have happened in the womb finally occurs.