There's a whole lot of stigma attached to guys' ring fingers. Throughout the years, studies have shown that having a longer ring finger than index finger can correlate to being able to run farther, and, oh yeah, might even mean you have a bigger penis.
"Our results suggest men’s pre-natal environment has an impact on the likelihood of being in a relationship with a more attractive and presumably more fertile woman," the study read, according to the Daily Mail. The study reports that the increase in ring-finger length may be caused by a "burst" in testosterone and mail hormones while a baby is in the womb.
“Eye-tracking studies have shown that, during evaluation of female body attractiveness, men focus mainly on the waist and breast areas, which deliver honest signals about a woman’s reproductive status,” said Berenika Kuna, the study’s lead author. The thought here is that men with longer ring fingers self-select for women who display those evolutionary signals of fertility.
It's worth nothing that the sample size and methods here aren't exactly scientific proof. Looking at only 50 men and saying that the long-ring-fingered guys were "four times more likely" than non-long-ring-fingered dudes to have curvy girlfriends could easily be a massive sample error, as the vast majority of men have longer ring fingers.
This article originally appeared on Men's Health