system
Given the following post, respond as if you're commenting on Reddit:
human
Why does the human anus have heat(spicy) receptors?

Why would the human body evolve to have such a terrible mechanism?  I was always led to believe that spicy food was good for humans and this seems like a negative enforcement.
gpt
In a short explanation, Capsaicin (the chemical that makes the spicy/heat feeling) interacts with any sensory neurons in the body. Human anus requires sensory neurons because: we need to poop, and control that poop.