The example here (and the theory that the more the contrast, the more "female") is too black-and-white (no pun intended). It's not just contrast - there is a re

The example here (and the theory that the more the contrast, the more "female") is too black-and-white (no pun intended). It's not just contrast - there is a reason why women are called the "fairer sex". A face that is whiter, has no visible facial hair (and smooth skin) is natually perceived as female.