Something that is generally thought to be a huge turn-on, but doesn't do it for me? That's the tough one...poop, pee, dirty underwear those are niche turn-ons anyway so that they don't turn me on is not surprising.

Generally accepted things though...nipple piercings. Nipples on breasts of any size are amazing and jabbing a post through one doesn't make sense to me.

I'll drool over a belly button piercing, a tongue piercing could be fun (but for practical daily wear, talking to a woman with her tongue pierced is a crazy distraction because all I can think about is that it's pierced to suck cock or better yet lick pussy), you could sell me on labia piercings, but leave nipples alone. (and don't get me started on those bull ring piercings)

Dirt
 

I thought most things were covered in this thread but I've seen a couple of pics recently that were a real turn off. Dirty feet, I mean really filthy.
Then a woman spreading with her fingers withs long dirty fingernails on her labia.

Women who are spreading their legs and there ass and thighs are covered with sores.

I'll add a couple. I don't like when women are photographed with guns. I'm not anti gun, but I hate how they are fetishized. Smoking is a major turnoff. I also don't like hidden cam or revenge type photos. Those are straight up violations of the victim's privacy.

Facials. I have never really cared for a guy cumming on my face or getting it in my hair or eyes. I have done it for a few boy friends and would still do it for one, but its not a big turn on to me at all. I think it is something that the porn industry created as a major turn on for some, but it never had been for me.

I will agree with you in part being that I hate dirty feet and lets get cleaned up before bed. But if my wife rides fences with me or does some work on the ranch that gets her dirty I find that to be a major turn on. It is hard to describe what I mean but we usually get cleaned up (usually together) before anything kinky happens.

I find women that are clearly not into guns posing with guns stupid and a turn off. They usually have bad trigger finger discipline (fingers on the triggers when not firing the weapon) which is a big pet peeve of mine. That said, if it is a real woman that is actually using the gun it is hot. Using my wife as an example, I have a picture of her putting her 1894 Marlin into the scabbard on her saddle and it is super hot. I have it framed in my locker at the firehouse. She had her sweat stained Stetson on, form fitting Wranglers tucked into her boots with spurs, and a pearl snap shirt with the top three snaps undone. A bit of her hair had escaped her ponytail and was blowing around and the colors from the sunrise were icing on the cake. She had no idea I was taking her picture and was pissed at first when I framed it and put it in my locker because she thought she looked like a mess.

Love to see that picture!

Nails and make up.
 

Long fake nails have been a turn off to me. Also to much make up just kills the mood as bad as a pair of stripper heels.

Puffy Tits - - reminds me of a little girl

premature ejaculators... lol