Vanity.

I was reading Life in the Straits Times, 1st Oct issue.

There was an artical on the movie The House Bunny.

Part of it says,

"...underneath every unpopular girl is a popular one waiting to come out, if only she were brave enough to bleach her hair, slap on the make-up and pad her bra.
Being unattractive is apparently a form of cowardice or laziness."

Well, I guess laziness is one main reason. However! What is attractive?
It really depends on how one defines attractiveness.