http://www.hookingupsmart.com/2012/10/11/hookinguprealities/for-some-women-promiscuity-is-hard-wired/

https://heartiste.wordpress.com/2012/03/09/is-finger-length-ratio-evidence-of-a-womans-fidelity/

Can you guys attest to this from previous exp? If you haven't seen your (previous) girls' fingers', a lower digit ratio would be noticeable by a more defined jaw line in a girl.