They found men were more likely to accept bad deals from attractive women.

They were also quicker to respond to fair offers from good-looking women and slower to respond to unfair offers.

Meanwhile, brain scans revealed that men were more sensitive to unfair offers when the woman was unattractive, and felt greater reward when the woman was attractive.

University of Stirling psychologist Anthony Little, who was not involved in the study told, The Huffington Post, it was not entirely clear why we behave differently toward attractive people

‘We appear to have a bias toward being nice to attractive people even when the rewards to ourselves, such as increasing the chance of a date, wouldn’t apply,’ Little said.