One of my biggest fears is that we can actually make that into truth. Fashion is powerful, and it's easy to google out problems women with the P word before their names can have dating.

And it wouldn't be without other costs (if the vision of society where the imagined genetic differences became true wasn't bad enough): increasing the variation between sexes would mean far more complicated genetic code. That would almost certainly have hard to predict, weird costs.

So far it doesn't seem to be happening, so I'll put that together with Peter Watts' fear that sentience is a side-product that will get optimized out, but still, it's a fear.