Foot fetishism

It is a fetish that a person is pleased to see feet (not necessarily be naked and not necessarily human beings).

Without giantess fetishism
Simply here will show feet, bare or not, of humans or not:

With giantess fetishism
If faced with a giantess standing on a flat surface and without any help to climb, the closest that would be to her will be her feet.

Although in practice it has been seen that artists (mostly fetishists) have given other uses to the feet, as the action of treading and destroying.