In a paper that appeared in the journal Biology Letters, the researchers found that women tended to make that judgment based on how masculine-looking the man was.
"Women's ratings of unfaithfulness showed small-moderate, significant correlations with measures of actual infidelity," wrote the team, led by Gillian Rhodes at the ARC Centre of Excellence in Cognition and its Disorders at the University of Western Australia in Perth.
Men, on the other hand, seemed to have no clue. They tended to perceive attractive, feminine women to be unfaithful, when there was no evidence that they were, the scientists noted.
http://www.reuters.c...s Oddly Enough)
The sample size is very small of course, but it could be interesting to see how this develops in further research.