Shoe fetishism is the attribution of attractive sexual qualities to shoes or other footwear as a matter of sexual preference.
In order to determine the relative prevalence’s of different types of fetishes, scientists obtained a sample of at least 5000 individuals worldwide from 381 Internet discussion groups.
The relative prevalence’s were estimated based on:
(a) the number of groups devoted to a particular fetish,
(b) the number of individuals participating in the groups
(c) the number of messages exchanged.
Using these measures, feet and shoes were found to be the most common target of preferences. (Source)