That's awesome, I was just thinking about this recently!
What actually makes a face masculine or feminine? Typical 'feminine' traits such as high cheekbones and full lips can look just as lovely on men, and appear masculine on them. Similarly strong jaws or heavy eyebrows can look beautiful on women. If you got rid of hair/makeup/whatever on a man and a woman, possibly siblings who have similar faces, I'm sure there wouldn't be much difference at all..