Men are suited for doing great things, sometimes destructive, sometimes nonsensical to the female brain, but still great things.
I do not believe that studies which spin such spurious correlations have much to tell us about the critical importance of fatherhood, or its appearance to diminish a man's manhood.
On the contrary, I think that there is no finer measure of a man than one who takes care of his family. A Dad is one of many men who portrays consummate manhood (although a man does not have to be biological father to accomplish to this).
About testosterone, this key ingredient in men is more than just drive, drive, drive. Higher levels in stressful situations enable men to think more clearly and decisively, for example, a trait which may seem conspicuously lacking among the ladies.
Thanks again for the insights, Paul. I look forward reading more of them.