If this pans out, it would mean that men with high testosterone levels, who are known to be bigger, stronger and more dominant, are more likely to have rounder faces - and that we evolved to judge such faces as aggressive because their owners are more likely to attack us…
… Just as an eyespot is not an eye, so a person with a baby face may not be babyish, but an observer is likely to respond as if they are, she says. It is a similar story with our reaction to unattractive faces, which she says is an overgeneralisation of an evolved aversion to people who are diseased or suffer from some genetic anomaly. There is also “familiar face overgeneralisation”, whereby people are judged to have the traits of others who they resemble…
But there’s a twist. Baby-faced men are, on average, better educated, more assertive and apt to win more military medals than their mature-looking counterparts. They are also more likely to be criminals; think Al Capone. Similarly, Zebrowitz found baby-faced boys to be quarrelsome and hostile, and more likely to be academic high-fliers. She calls this the “self-defeating prophecy effect”: a man with a baby face strives to confound expectations and ends up overcompensating.
Fast forward the video to about 45 seconds in for visuals.