Framing this as a contest is where the confusion starts. Put feet and ass on opposite sides of a ring and you have already assumed they are the same species of interest, competing for the same slot in someone's head. They are not, and noticing that is more useful than picking a winner.
One of them is a fetish in the way sexology uses the word: erotic attention fixed on a body part that is not itself a sexual organ, sometimes strongly enough that it becomes the point rather than an accessory to it. The other is a preference for a secondary sex characteristic, which is roughly where breasts, hips and shoulders sit — conventional, unremarkable, and heavily catered to by mainstream media long before anyone called it a kink.
Why one of these needs explaining and the other does not
Nobody writes papers asking why buttocks are attractive. The interest tracks visible sexual dimorphism, it is culturally ubiquitous, and it has never needed a theory.
Feet are the interesting case precisely because they are the exception: not a sexual characteristic, not conventionally erotic, and yet consistently the most reported body-part focus whenever anyone surveys fetish communities. That finding is durable enough to be worth stating; it is also worth stating that the surveys behind it mostly sample self-selected online groups, which tells you what people who join fetish forums are into rather than what the general population is. This article names the finding without a primary citation, so treat it as the shape of the evidence rather than a measurement.
Three explanations get offered for it, and none is established:
- Cortical adjacency. The brain's map of the body places the feet next to the genitals, so the popular theory goes that signals bleed between neighbours. It is a neat story, it comes from a serious neuroscientist, and it has never been demonstrated. Treat it as a hypothesis that survives because it is memorable.
- Learning. Erotic response to a neutral object can be conditioned, which has been shown under laboratory conditions. What that does not explain is why the conditioning lands on feet so much more often than on elbows.
- Position. Feet are at the bottom, they are what you look at from your knees, and a great deal of foot content is structurally about being below someone. On this reading the fetish is not really about feet — it is about the posture they imply, which is why so much of it lives next door to femdom rather than next door to anything anatomical.
The honest position is that the third explanation covers the most content without needing the first two, and that nobody has ruled anything out.
The part where a preference becomes a problem
Almost never, is the short answer. Diagnostic criteria for fetishistic disorder are not met by having a strong and specific interest; they require that it causes real distress or gets in the way of your life. Wanting one thing consistently is not a symptom, and "is this normal" is usually a question about shame rather than about psychology.
The one situation that genuinely warrants attention is when nothing else works any more and you mind — when the specific thing has crowded out partnered sex you actually want to be having. That is worth raising with a therapist who works on sexual issues, and it is not the same conversation as whether the interest itself is acceptable.
Why the two economies look nothing alike
Here the distinction stops being academic. Foot content is not nudity under most platform rules, and that single fact restructures everything around it.
Content that keeps its clothes on can be posted, promoted and paid for on general-purpose services that ban explicit material outright. It can be produced without a set, without a scene partner and without anything the poster would mind being seen. Dedicated marketplaces exist for it — FeetFinder is the obvious one, and there is a longer breakdown of how that market actually works in the foot-content economics guide — but the reason a market that specific can sustain itself at all is the policy gap, not the demand.
Ass-centred content has no such advantage. It is explicit, it is mainstream, and mainstream means competing with the free tubes on their own ground. The commercial versions are studio productions — BangBros and AssParade are the long-running examples — or they are creator subscriptions, and both are selling against an enormous free supply of exactly the same thing. The custom-clip market on platforms like Clips4Sale works for both, but it is doing different jobs: for feet it is often the whole business, for ass it is a specialty line.
Anything you read about what either earns should be treated with suspicion. The figures in circulation come from marketing material and from the small number of sellers with a reason to publicise good numbers, and there is no audited source for any of it.
Why "which is more popular" has no answer
You will see the question settled with search rankings. It cannot be, for a reason worth understanding.
Search terms measure what people type into a general tube, and general tubes are where mainstream categories live. A term like ass is entered by people with no particular fixation, constantly, because it describes half the catalogue. Someone with a specific foot interest is more likely to go straight to a site or a seller that only does that — behaviour a search-rank table on Pornhub, xHamster or Xvideos never sees. The instrument systematically over-counts the broad interest and under-counts the narrow one.
Year-end platform reports get quoted as though they settled it. They are marketing publications about one service's traffic, they are not comparable across years or across sites, and the country-by-country breakdowns that circulate from them are the least reliable part. Nothing here reproduces them.
What is actually worth knowing about yourself
Not which side you are on. The more informative question is whether the interest is additive or substitutive — whether it is one thing among several you enjoy, or the only route that works. Those two states feel similar from the inside and behave completely differently in a relationship, and the second is the only one where anything needs to change, and then only if you want it to.
Second: separate the body part from the scenario. A great deal of what reads as a foot fetish is a dominance interest that found a prop, and a great deal of what reads as an ass preference is really about a specific act. Working out which layer the charge is actually on tells you what to look for far better than a category name does, and it is the difference between browsing endlessly and finding the thing.
The fetish section is organised by that logic rather than by anatomy, which is generally the more useful way in.