Cheerleader Effect
The cheerleader effect (sometimes referred to as the group attractiveness effect)is a reaction that causes a person to perceive that others are more attractive when seen in a group than they are perceived when seen as individuals.
For instance, a woman might look at a photo of a football team and believe that this is an incredibly handsome group of men. However, show her the same individuals as single photos and she will more likely to see their physical flaws and rate them as less attractive. Research is being conducted as to why this phenomenon seems to occur.