Now - you know what I think about this kind of biological determinism. I think it's bollocks. That is - it could be the case, a species could work like that, but it doesn't actually apply to our species. But mostly because I don't fit into this Mummy Bear/ Daddy Bear world view.
Looking at my fingers - my ring finger is a little smaller than my index finger. Am I low testosterone? Then how come I am pretty good at maths, and quite aggressive? (Not so good at parking and woodwork though) Could it be that oestrogen pumps you up just as much as testosterone does? I bet nobody has ever bothered to check.