It could be a slight genetic mutation. Since time immemorial there have been males dressing and or acting in female gender roles. I kind of doubt that though because it would be easily explained then and even though the song from AvenueQ says it, they haven't found a gay or CD gene (and they would not be relater either since more than 1/2 here are straight and dress.)NICKY
YOU CAN COUNT ON ME
TO ALWAYS BE
BESIDE YOU EVERY DAY,
TO TELL YOU IT'S OKAY,
YOU WERE JUST BORN
THAT WAY,
AND, AS THEY SAY,
IT'S IN YOUR DNA, IF YOU WERE....
A combination of nature and nurture to EXPRESS the desire is more likely. Otherwise there would be a obvious line. Your Uncle Joe...his cousin Ralph...your great aunt Gertie who was really a spinster male living with 30 cats and a canary.