> First on sex/gender: I feel that hormonal differences create psychological differences in the norms between genders. This is why men are generally more aggressive and violent(see higher incarceration rates) and women are more nurturing.

There's strong evidence that genetic differences account for some behavioural differences between men and women. The ones you suggest do make it clear why you'd expect a skewed distribution of genders in fields such as the army or midwifery. It's much less clear that genetic differences should lead to such an underrepresentation of women in tech fields; in this case I suspect that culture and social inertia are a large part of the explanation.