THEY SAY you should never judge a book by its cover.
But, when it comes to spotting a cheat, the looks could be revealing.
According to a new study, cheating men can be easily identified by the shape of their face.
Research published in the Royal Society Open Science journal found that men with more “masculine” faces were more likely to be viewed as unfaithful by their partners.
More significantly, these men were found to be more prone to cheating, according to data supplied by the men themselves.
A total of 765 men and women were studied as part of the research.
They were presented with a series of photographs and asked to judge the facial features of 189 white adults snapped as part of the study.
In each instance, they were asked to rate how faithful they felt each person photographed would be on a scale of one to ten.
Heterosexual women were able to spot untrustworthy partners while men were also able to recognise males who could pose a potential threat.
Researchers noted suspicion often arose from men with masculine features - such as a strong brow and jawline, or thinner lips.
But while women were able to pick out cheating men, men struggled to find the women more liable to commit adultery on the list.
The researchers attributed this to the fact women are not only less prone cheat but often wear makeup to mask certain facial features.
Despite the revelations, researchers concluded further experiments are required before any conclusive answers can be drawn.