Why is it that we find symetrical faces more attractive?

Question: Why is it that we find symetrical faces more attractive?
- Keywords:
  attractive,
  faces,
  symetrical
Asked by bethx1 to Ed on 13 Jun 2011.
- Ed Morrison answered on 13 Jun 2011:
  
  Scientists think this is because a symmetrical face is one that is healthy and has good genes which can be passed on to children. A face that is not symmetrical may have been exposed to diseases and so may not be the best to mate with.

Question: Why is it that we find symetrical faces more attractive?