[bradyd]

I think the main reason people choose the image of the man on the left is because the lighting in the picture on the right is worse. It casts sharp shadows which makes his neck and face look weird. I bet if the lighting was more diffuse, like the photo on the left, the results would be different.

[alistairSH]

Not just that, but the pose is completely different as well. It very well could be that women are reading into the poses. The left is casual and relaxed. The right is a very posed "flexed" look. Maybe women see the right and jump to "narcissist, would not bang".