Part of the testosterone thing is evolutionary. Men and women are physiologically moving closer together in certain ways, and have been doing so for the last several thousand years. This is a natural product of the increase in quality of life, which also decreases the rigid division of labor between the sexes. In the pre-agricultural revolution, hunter-gatherer days, men and women didn't have a huge division of labor. They both hunted, both gathered, and both raised children. Then, after the agricultural revolution came the division of labor that most "traditional" people now refer to (men work, women stay at home and raise kids, men do physical labor and entrepreneurship, women do cooking and cleaning, etc.) The revolution didn't change our physiology much, though, and didn't have time to, because less than 10,000 years later, we're already becoming more and more egalitarian again.
Here's an anthropological review that mentions it:
http://www.anthropology.emory.edu/FACULTY/ANTGA/Web Site/PDFs/Sexual Dimorphism and Human Evolution.pdf