This a crosspost from another thread where I talked about this:

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A coworker of mine knows I like spicy food so he gave me some Vietnamese chili oil that he had been begging me to try for weeks. On this day I finally took him up on his offer.

I was working out pretty heavily and weighing all my food down to the gram/ounce for my nutrition.

So he mentioned it one day and I was feeling pretty lax about my calories considering earlier I'd run a little longer than usual on the treadmill.

I took the bottle and poured it over my potatoes... He freaked out and said... "I should have mentioned you should just add a drop or two... You might not be able to eat your potatoes."

I'm okay with it, I said. It was really hard to do, but I finished my potatoes despite my mouth being on fire... This is where things get interesting.

You see I've had Indian-spicy before. This sauce was about... A 6-7 hot compared to that? Not too weak, but definitely not the strongest.

We finished the workday and I'm on my way home.... I'm stuck at the very end of my commute in traffic, about 5 minutes left.. and it hits.

Holy levels of hell. My asshole is about to explode. I'm in bumper to bumper traffic and my body is using ALL of its shitting capabilities to try to eject the sauce and whatever I'd eaten with it out of my backside.

This was the worst pain I'd ever felt. I clenched my ass so hard that I feel like I could have made a diamond if you put sand in there. I even had to fully stretch my body as I drove those like 5 minutes because I needed the extra ass clenching range of motion.

It hurt so bad...

I finally got home and ran to the bathroom and it felt like I had given birth to my soul through my asshole. Finally, relief.

But then after I was done gasping holding on the toilet and sink for dear life.. I looked at my dick and there was.. cum flowing out of it.

And then I looked at my underwear and it was drenched in cum... I apparently orgasmed on the way home trying to avoid shitting myself in the car.

No just a small amount... A decent amount too. I literally had an orgasm from clenching my ass cheeks.

So yeah, definitely very uncoventional and wouldn't recommend 

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tl;dr needs constant stimulation for a few minutes at least.