That is a fetish, a behavior that causes self-satisfaction due to a psychological subconscious association.
Philosophically we could pose some questions. First of all: what does the word 'behaviour' mean. Secondly: how can anyone experience 'self-satisfaction' by 'behaviour' and third what is 'psychological subconscious association'? To put it straight: none of these principles exist or have any influence on sniffing female feet. It's just a remnant of gynophagia or eating women. He who sniffs likes to suck and lick and eventually fantasizes about eating woman's feet.
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I think men the like the smell of women's feet is because men are attracted to the natural sweaty smell of a woman's feet and the woman's personal preference of lotion she uses that gives her that gives it that smell that arouses a man. Not all women feet smell the same because all women do not use the same lotion. So, the natural sweaty smell of a woman's feet mixed with her lotion gives u that sexual arousal.
Well all men are different. For the one's that like feet, perhaps they like or love a woman's feet because it is so much better cared for than their own. Perhaps they like how they look, and feel compared to their own particular feet. Also too, perhaps they like how sexy they look inside high heel shoes or boots. Maybe it's a turn on to see how they make the legs look sexier.
There are many reasons why some men are attracted to girls feet. Some men have certain fetishes, and some have a fetish, or uncontrollable desire, to see, touch, and do things to womens feet. Also, some men just like women who have cute feet.