During the study, scientists found that children especially girls, portrayed a preference for an attractive face as compared to an unattractive one.
"We see from the results that children and especially girls have more trust in attractive faces, even though there are no obvious reasons why people with more attractive faces would be more reliable or knowledgeable," Bascandziev says.
It could just be that we feel more comfortable with people who look attractive. So, there appears to be a certain bias towards attractive individuals.
Source: Medindia