XKCD

I have (well I guess I can't really claim any insightful credit here) a theory about how those who regularly casually dated etc are usually in a better standing to pick a long term partner than those who didn't or stuck to a few longer term relationships. I'll leave it to XKCD to express this mathematically:



Don't forget to hover over the image to see the title. If you think about it, it's actually quite obvious.