I don't know very much about genetics but I do know this:
XY females are people who are genetically male but physically female. This occurs when the fetus doesn't recognize the horomones that activate the body to develop as masculine. Since the male and female genitial structures are homologyous, what might have been a penis becomes a clitoris, what might have been testicles becomes a labia majora, etc. They tend to be tall with well developed bodies, clear, beautiful skin and are usually very beautiful. Not that I'm saying she is an XY female...just thought I'd share what I've learned in biology class. :-)
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Be cheerful. Strive to be happy."
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