Greg Laden summarizes the evolutionary origins of human gender disparities.

I live with two females, and one of them is the only person in the house who can program the VCR. I can do it if I need to, but I threw out the directions and it will take me a while to figure out, and blood will be spilled and profanities uttered. Both of my female house mates are about as fixated on the remote as I am. They tend to be able to find it more easily than I can, because their ancestors were gatherers and finding the remote is roughly the same thing as finding nuts, berries, and most importantly, plant underground storage organs. I, on the other hand, descend from a long line of hunters, so I tend to hunt the remote. Hunting, as is well known, tends to yield a more inconsistent return. So most of the time I don’t find any remote at all, and now and then, I find three or four of them in one episode of searching.

I’m sure that a similar argument will soon be able to explain the different sizes of the male and female crockus. Clearly, the crockular region of the frontal lobe was once used to coordinate the swimming motions necessary when holding a child in the water, as per the aquatic ape hypothesis.