The size of the group was not important. The effect, however, is quite weak. The attraction was increased only by 2% (also men).
Walker D. & Vul D. I. E. (2013). Hierarchical Encoding Makes Individuals in a Group Seem More Attractive, Psychological Science. doi: 10.1177/0956797613497969
Zdjęcie (C) www.flickr.com by Shane Michael Black