Hmm. I wonder how exactly testosterone works in the mind and body, then? There is certainly a group of men who are less aggressive than a group of women, so do those men have less testosterone than the women more aggressive than them? Do men have a sex-unique mechanism that prevents non-extreme-but-higher-than-women levels of testosterone making them super violent? Could it be as simple as developing resistance to it after a lifetime of exposure, like with many substances and neurotransmitters?

I might have to do research on this.