The truth is beauty is not skin deep, it is
genetic. It is human nature to pursue beauty because it strengthens our own gene pool. Usually beauty is defined by body symmetry. One
study actually came to the conclusion that
symmetrical people where judged more attractive than non-symmetrical people.
So what you ask?
Non-symmetrical bodies and faces are a visual clue that the person you are looking is genetically “defective”. Another study had a group of pictures shown to people from different countries, consistently the same people were found attractive. Beauty it concluded was not a cultural phenomenon.
Just what I picked-up from Mean Genes, a book co-authored by Jay Phelan who earned his Ph.D. in biology from Harvard and specializes in evolutionary genetics and aging.
Personally I think the saying means just what it says, “beauty is only skin deep”, true beauty lies beneath the surface of the superficial exterior.