Women's brains are different. They have less grey matter and more connective tissue. So do psychopaths.
"Connective tissue" is relatively inert material that holds cells and organs together. White matter is not connective tissue, it is mainly the wires (axons) that transmit signals between neurons located in different parts of the grey matter. So, if women really have more white matter, one could argue that their neurons have more connections, and they are better able to integrate disparate clues etc.
A bigger brain does not mean more neurons. If the brain is 5% smaller, perhaps the neurons are 5% smaller on average. Smaller neurons may be slighlty more sensitive to disturbances like starvation, fever, and alcohol, but on the other hand (as in integrated circuits) they may be somewhat faster, both because they take less time to "charge" and because the connecting axons are shorter.
However, the idea that size or shape of the brain are related to "intellectual ability" (whatever that means) is just barstool science. "Men have higher gray to white ratio than women, and men are more intelligent, therefore higher G/W implies intelligence, therefore men are more intelligent than women."
I don't know whether women are more intelligent than men, but they do seem to be more sensible. Perhaps because men have this urge to do stupid things in order to impress women. "Look at me, what I am doing may be totally stupid, but it shows that I am strong and nimble and can endure hardship; so please have some of my DNA, which carries these traits but does not carry my stupidity (unless you are unlucky and get my Y chromosome together with the rest)."
In particular, I believe that it is not a coincidence that there are so few women who are "into" bitcoin.