As a life long spicy pepper eater. This is 100% correct from my understanding.
The real question is, why the fuck do we have capsaicin receptors in our fucking anus?! What kind of cruel twist of evolution is that nonsense?!
I too am a life long lover of spicy food, and it didn't start burning my butthole until a few weeks ago. I spent all of last week eating copious amounts of spicy food trying to desensitize my bum, and it didn't work. All I got was constant burning poops. It was quite miserable.
You know what's hell on earth? Liquid capsaicin diarrhea. I had that once. I ate a kind of spicy clam soup in the beach, having beers, the entire afternoon under the sun drinking beer after beer and eating that poisoned clam soup. I'm gonna tell you, after the 5th or 6th time I've gone to the loo to expel that liquid burning jet of capsaicin juice, I started doubting the advantages of being alive.
Well, pepper plants developed capsaicin to avoid being eaten. We developed a bit of a masochist palate. Uranus just didn't adapt to that yet. In a few generations, my friend.
Of course. As long as the capsaicin oil is strong enough to burn your anus, anyone who licks is will notice the heat. Whether it burns their tongue will depend upon their tolerance to heat in peppers that were in your food.