Shoes are useful for more than just walking. Both men and women have a tendency to fetishize footwear. High heels and boots being the most popular.
Sometimes this is merely about appreciating the form. Once and awhile it involves smell. A lot of times, a Dom will walk on a sub and even make them lick the shoes or boots. This is a popular part of BDSM scenes.
More fun with fetishes discussed here:
Nylon Fetish, Sock Fetish, Women's Lingerie p>