Are you a big faced dude? According to a study by two management professors at the University of California, men with wider faces were more likely to cheat and lie for financial gain.

Their latest study finds that people perceive men with wider faces as more aggressive and less trustworthy, so they tend to act more selfishly toward them, thus eliciting selfish behavior in return.

Multiple experiments were conducted with more than 100 participants in each. Researchers found men with wider faces were more selfish when allocating resources between them and a partner.

Another study involved showing participants a picture of their partner in the same resource allocation task. Some were shown digitally manipulated pictures of a man with a comparatively wide face, while others saw the same man with a narrower face.

Those who saw the wide-faced man anticipated selfish behavior and were selfish in how they divided the resources. The participants thought working with a narrow faced man would be more cooperative.

The researchers found that treating someone selfishly led them, in turn, to act more selfish. According to the paper:
Our results suggest that men with greater [facial width-to-height ratios] experience less cooperation and more competition from others compared to men with smaller [facial width-to-height ratios], and these differences in exposure to social interactions may also affect men’s general predisposition to cooperate or compete.
Is this a scientific validation of the Golden Rule? And while wide-faced men may be perceived to be untrustworthy, the bigger take-back from this is: if you're mean to people, they'll be mean back to you.

The full study is available in PLOS ONE.