I don't like those huge clunkers with 2" soles & 7" heels either - they're grotesque, and make the girl look out of proportion when she's standing. On the other hand (or foot), the classic 3" stilletto, which hasn't changed in essence since the 1930s, still has its delights - mainly based on its effect on the calf-muscles.
But these things are only for show. When I visit a nice, pretty young lady for sex (as I do once a week), I always start by taking her shoes off - which has nothing to do with foot fetishism, but because my own feet will be bare, and accidents can happen. I don't want a stilletto through my instep. The girls are used to me, but they always greet me in their heels, even so. Professional pride, I presume.
But sex is really just an intense and specialised way for people to be kind to each other; and if for some people the foot (which doesn't have to be dirty or smelly in a country with hot running water) is an erogenous zone, good on them!