Friends, siblings and spouses are more likely to agree on what is attractive, a new study by Harvard University has shown.
While there is likely to be some agreement among strangers about facial attractiveness, there is more divergence of opinion between people who know each other well.
And the more time people spend together, the stronger their agreement is likely to be.
Richard Russell, a researcher on the study, said: "While there are some universal standards of beauty, this study shows that perception and standards of attractiveness are more likely to be shared among individuals who know each other well."
Explaining the results, Matthew Bronstad, who also worked on the research, said: "Because close relations know and see many of the same people, their visual 'diet' of faces has been similar. It's likely that repeated visual exposure to the same faces could have an effect on their perception of what makes a face attractive."
Further research will explore whether how people determine attractiveness has any genetic connections.