First up.
I'm going to start coming down on the joke answer to a serious thread stuff. It's derailing. And I'll start to ban if I see someone do it often enough. We have a humor forum for you to make with the yuk-yuk's in. Go there to do it. Mocking out people in threads with serious topics is not cool here.
Also White Knighting is another item on my don't do it list. All it does is further take topics off message and start fights. Don't fight others battles. Report posts that you feel are out of line and they will be evaluated.
Now on topic:
Why are some guys into feet?
Ask yourself why some guys are into breasts.
It makes about as much sense. I've known more women who are mystified why boobs hold such attraction to most guys. They just accept it, as it's what our culture has decided is the 'norm' for guys to be attracted to.
Feet, bellies, legs, asses, elbows, it's all arbitrary. Sexual likes start on a base made by ones culture, but are like a deck of cards dealt at random from above. You get feet, you get legs, you get asses, ooooh tough luck dude you got the back of knees. And so on. They form up during sexual maturation based on random environmental impacts.
Some happen more often then others (like feet) because there are more impact opportunities for said body part in the the average exposure range.
Human sexuality is wonderful because it's so flexible in it's creation in each individual. The factors that go into each persons unique tastes are uncountable, and can hardly be unwound easily because they form up without any conscious realization that an environmental vector has had an impact until long after it has, and has produced the result of a preference forming. It's what makes parents that try and shield their kids from every possible sexual thing so funny. It's not overtly sexual vectors that inform a sexual matrix as it forms, most of them are random non sexual ones that mix in by random.
We seem designed to build a sexuality out of what our environment offers us. And most of the time this produces a nice 'norm' sexuality which makes statistical sense. But distributed across the sample will be one, two, three, and even bigger sigma deviances from the norm as part of the process.
This is an evolutionary strength. As it allows for new stimuli to be selectable for arousal. A good thing if environment changes and traditional sexual cues vanish.
Myriads