Fair enough. I'd say Tarantino explains his perspective fairly well in Pulp Fiction. It's a sensuous thing. But the way I see it, feet are sensitive. Sometimes overwhelmingly so. Feet get hidden away inside shoes, decorated and accentuated by heels and jewelry, and revealed by sandals when we go swimming. Our reactions to foot stimulation often develop early in life. Tickling. Running around barefoot. Secret footsies under the table with a crush despite family or friends all around. I can see how that becomes a kink. As a fetish needed to get off though, can't say I relate.