There's an article about why people like spicy food (even, and especially, to the point where it induces pain).
Why Does Spicy Food Taste Hot? | Wired Science*| Wired.com

Article writer Jonah Lehrer shares that "Dr. Paul Rozin at the University of Pennsylvania" has a theory "that we’re in it for the pain."

So, I ask, how many of us straight razor shavers (who occasionally experience some nicks and cuts that hurt):

How much heat do you like to eat?