Women and thier feet?

We all know the cliche that women are obsessed with shoes (an there is definitely truth to it), but women concern for their feet doesn't end there. Women's feet are a billion industry. We get pedicures, paint our toes, buy special foot lotions and scrubs, fancy sock and of course shoes. Studies have been done on women that have endured psychological trauma and constant theme is recollection of their footwear. Women who have experienced such trauma are likely to remember the shoes they and others were wearing at the time in great detail. Also a group of women who imprisoned in a concentration camp reported that one thing that greatly affected them at the time was that they were barefoot. Does anyone know why we have such a psychological bond with caring for our feet?