Why are your one otherwise a lady?
There are many cultural and you may social things involved in and make an excellent child on a man otherwise a female. But naturally talking, sex starts when you find yourself merely a tiny group of tissue for the the mother's womb.
I've a pretty good basic idea off exactly how “maleness” or “femaleness” grows for the an individual embryo, and how this is certainly translated into the capability to build egg or sperm.