I believe in sociology, it is merely defined as the near universal tendency for women to mate across or upwards with respect to status hierarchies.

That said, it seems legitimate to explore what such a tendency implies, if anything, about either female nature or perhaps just the inevitable effects of motherhood on any society, etc.

I'd love to keep this as judgment and hate free as possible so as to encourage actual and honest introspection and contribution from women. Of course I'd love to see a lot of things happen...