This is just bad science, incorrect science.
No woman is born with a man’s brain. No man is born with a woman’s brain. Their genetics are XX for female, XY for male.
What they COULD be suffering from, is a female body who’s hormone levels are abnormal, and are either creating too much testosterone (for a woman) and too little testosterone/too much estrogen for a man.
Hormonal imbalances can be medically dealt with, and to la lesser extent, through diet as well. For women eating more soy and other estrogen-mimicking substances, and for men, avoiding soy and other estrogen-mimicking substances.
You are wrong. XX and XY are the most common makeups, but there are many others. I went to high school with a person with Turners Syndrome.
http://en.m.wikipedia.org/wiki/XY_sex-determination_system