Quotes from David Bainbridge

As a result, human female pelvises are exceptionally large – even before puberty, but much more so after it, when its internal capacity increases at the expense of efficient walking and running.

The 'big three' desirable features for a heterosexual man's mate are perhaps unsurprising – femininity, health, fertility. Men seek women who look obviously like women; men seek women who have good genes and are healthy; men seek women who look like they have years of efficient breeding ahead of them.