I'm not sure anybody who has read studies about biological preferences claims that they explain the 70/30 population split. That would be ludicrous. What nobod

I'm not sure anybody who has read studies about biological preferences claims that they explain the 70/30 population split. That would be ludicrous. What nobody seems to consider is that an initial small biological difference may very well be amplified into a large cultural preference over time, due to network effects. A self fulfilling prophesy, if you will. I'm just speculating here, but it seems plausible to me, at least.