A new study indicates that men have developed an ability to identify if a women is likely to cheat in a relationship just by looking at her face in a photograph.
Researchers from the University of Western Australia showed men 17 pairs of images of unfamiliar women who were matched for age and ethnicity. While one woman in the pair reported never cheating on her partner during a committed relationship, the other reported having cheated on at least two occasions.
The team asked men to judge which woman in each pair was likely to be more faithful. The task was carried out twice with different groups of men. Men just judged faithfulness just by looking at women's faces and the assessment was accurate 55 to 59% of the time.
Samantha Leivers from the University said that men's judgment of faithfulness made from faces of unfamiliar women may contain a kernel of truth.
"We do not expect them to be 100% accurate when they are literally just looking at someone's face for a few seconds. The fact that they are showing any accuracy from this limited information is pretty cool," Leivers told ABC science.
The study provided some evidence that human males had evolved adaptations to prevent cuckoldry, Leivers concluded.