(NSFW) What's your odd fetish that gets little to no art?

Fetishes are all over the place, from simple actions to body parts, from digestion to lactation. But that’s the light end of the spectrum.
 
What fetish of yours has little to no art from how niche it is?

Wet and Messy fetish. There aren’t enough pics of ponies getting covered in muck and slime.

Chastity/orgasm denial is a fun one, but there’s very few pictures of it - only 134 images tagged “chastity” on Derpibooru, in fact.
 
Long term chastity is especially interesting to me - where someone is forced to wear a chastity cage or belt for up to weeks at a time, not necessarily knowing when they’ll be allowed their next orgasm, and potentially being teased frequently and left in a state of constant frustration by their keyholder.
 
Unfortunately, there’s even fewer long term chastity pics on this site - most of them seem to be short term/play chastity, where someone is wearing a chastity device for the duration of a bondage/play session, and would (presumably) have it removed once that’s over. It kinda makes sense though - it’d be pretty difficult for a pony to wear a chastity device (especially a belt) for weeks at a time without anyone noticing it.

Characters (either pony, anthro, or humanized/EQ) using toilets.

Ballerinas and music boxes with ballerinas artists always focus on contortion or bondage with ugly outfits or lingerie not that there’s anything wrong with that but the only time you see someone doing Sexy stuff in a good looking professional ballerina outfit it’s a dude and music boxes are pretty much self-explanatory so much potential and almost no art of it

Axillism.

Girls in sinks

@Background Pony #8A94  
Is this a euphemism?

Pony feet.

@The Last Reviewer
 
Do you mean hooves? Or Ponies with human feet?

Human feet.

Uhhhhhhh.
 
Humanized Amazonian Ponies, taller than the males with big fat lips that like to smooch and douse the shorter gender with wet ripe lipstick marks.
 
So a combination of a Lipstick Fetish and an Amazon one.

@Colossal Jelly Trixie  
Not what you said,but yes human feet.

R. Kelly’s sheets

@jakcspellgood  
Ballerina delivered!  
https://derpibooru.org/1071861

@AaronAmethyst  
Awesome thank you she’s beautiful

@jakcspellgood  
Not a problem. I’m trying to get more together for you.

@AaronAmethyst  
What is it?

@The Last Reviewer  
A good amount of the stuff I draw has anthro ponies with human feet…though the feet aren’t exactly the focus…
 
As far as something I like that doesn’t get much art…. I dunno. Most of the things I can think of already have a bunch of art on here already. I guess I’m too vanilla XD

Explicit ponies in hoodies.

@Splinter  
Like, as in spouting profanities? Or just nude besides the hoodie or doing nsfw things?

@tigerfestivals
 
To be honest, I kinda find anthros with feet to be sexier than hooved anthros. Even if the feet aren’t the focus, it just makes the body look better usually.

@tigerfestivals  
I mean nude ponies in hoodies.

@Splinter  
I can see the appeal of that and you also give me an idea but since I’m not that good at art yet it’ll take a while

@tigerfestivals
 
@tigerfestivals  
Oh can you give me a highlighted link please?