Here's a link proving women's hypergamy with just using strong jawlines as an example of how women prefer men with a more defined jaw line while fertile and ovulating over more feminine characteristics on other men.

Recently got into a petty Facebook spat (stupid on my part) on a friends page and my friend's friend was out of anything valid for an argument then resorted to flat out, name calling/superficial attacks stated :

“Dude you have a huge jaw"

...In my head I was thinking,

“....wtf, is that an insult ?...I thought it was more masculine to have a stronger jaw line...but whatever"

Then I did a little research to see what jawlines did for a man, lo and behold, hypergamy proven with scientific research.

Anyways my response to him though, was “Yeah, sure, whatever man." Not trying to play into his frame.