Natural selection, it seems, often smiles on strumpets. Sorry, boys. — Olivia Judson

If a proclivity for promiscuity is genetic, then yes, promiscuous behavior will become more common if loose females tend to have more children than their monogamous peers. That’s how natural selection works.

Indeed, natural selection discriminates against well-behaved losers.

You’ve just got a case of SINBAD: Single Income, No Babe, Absolutely Desperate.