Pamela Andersen and Marilyn Monroe are both defined as being physically attractive. But there are different kinds of "attractive"..Monroe is the classy "girl next door" beautiful and Andersen is that tough trashy attractive. Andersen I think comes off that way because of how big her physical assets are and how much make-up she uses and the way she presents herself. Monroe is the type of girl that you would like to take home to your mother.
As a society, I don't think that we truely understand what beauty is. What defines a women as beautiful. We are so obsessed with the physical aspect of beauty, but it's much more than that. Beauty is outer AND inner appearance. But thanks to the media, being truely beautiful without make up or cosmetic surgery has become a nearly impossible task. What we need to all understand as a society is that our imperfections, our differences are what makes us all different. What makes us beautiful.