New research suggests that men with wider faces may be perceived as more capable of protecting children, a trait that could influence judgments about their parenting abilities. The study, conducted by a team from the University of Arkansas at Fayetteville, analyzed the facial width-to-height ratio—a measurement comparing the horizontal distance between a person's cheeks to the vertical distance from the upper lip to the brow.

In one experiment, over 100 participants were asked to rate photographs of 20 male faces on their perceived effectiveness in protecting and nurturing children. Men with wider faces received an average protection score of 4.23 out of seven, compared to 3.84 for those with narrower faces. No significant difference was found in nurturing ratings between the two groups.

A second experiment involved participants selecting up to five men they believed would be best at protecting offspring. Men with wider faces were chosen more frequently and were also perceived as being stronger and more aggressive.

Lead author Mitch Brown told PsyPost that the study's findings suggest a strong signal value in facial proportions, potentially stemming from ancestral conditions where quick inferences were necessary. "Ancestral conditions likely saw individuals having to infer information relatively quickly without having the chance for fuller interactions, which may lead to an advantage in forming stereotypes with minimal information," Brown stated.

The researchers propose that beyond good genes, humans consider a potential mate's capacity and motivation for investing in children. The study, published in Evolutionary Psychological Science, noted that men's social status has historically been tied to their physical capability in conflict.

"The advantages afforded to formidable men would lead to women recognizing the benefits of such men in parenting decisions and valuate the potential benefits for families," the paper concludes. "Namely, perceivers ascribe greater effectiveness in, and motivation for, offspring protection among [wide-faced] men, which shapes a coalitional preference for such men as fathers."

This perception may contribute to why broad-faced celebrities like Chris Hemsworth and David Beckham are frequently featured on lists of attractive celebrity fathers.

The findings could go some way to explaining why broad-faced men – including Chris Hemsworth – regularly feature in ‘sexiest celebrity dad’ lists