Participants were asked to rate the attractiveness of female and male faces presented in group or isolation.
On average, they rated faces in a group as being more attractive than the same faces rated in isolation.
We tend to think individuals are more attractive when they are in a group.
See the full study here :
Walker, D., & Vul, E. (2013). The Cheerleader Effect: Hierarchical Encoding of Individuals In Groups. Journal of Vision, 13(9), 853-853. doi:https://doi.org/10.1167/13.9.853