Not sure this holds up. I'm extremely familiar with subsaharan Africa. Whether a tribe is patriarchal, egalitarian, or matriarchal in nature, you tend to observe the females "embracing softness".

I don't have an answer as to why that is, but the "scarcity" theory is consistent with my observations. The "social organization" theory is not. That's not to say that "scarcity" theory is correct, only that it isn't contradicted by observation in the same way that "social organization" theory is.