A study led by Daphna Joel at Tel Aviv university has shown that there’s really not much in the way of difference between male brains and female brains. There are features that are more prevalent in the brains of women and features that are more prevalent in the brains of men. But human brains tend to have a highly individual mix of such characteristics.
Interestingly, while hardly anyone has anything like the full set of mostly male features or the full set of mostly female features, by no means everyone with a significant collection of “female end” features is female, and vice versa. What’s more, many of these characteristics aren’t fixed. Environment and experience also play their part in shaping the brain, increasing its individuality.
No one has ever said that sex determines brain type. Only that the distribution is uneven.