not to sound stupid & shit but
I believe in my dick
God fucked the Earth and from Her came humans... The first being was made in the image of God so he was the fucker, and since he had an XY chromosome he was able to extract out an XX chromosome. you cannot get an XY chromosome from an XX Chromosome because there is no Y in XX... anyway, I don't know how she came to be... But it had to come from the man first. I'll figure it out eventually, but yeah, I believe in my Dick.