I have a few thoughts on this concept.

1) Pleasure is experienced centrally thru the dopamine reward system.
Basically for survival, pain is an aversive stimulus...to urge us to move on or stop the activity causing it. We would not live long if pain stimulated pleasure or dopamine release. (this is for the majority)

2) however, there are people who have brains that are wired differently.
Extreme examples are psychopaths...who are pretty numb and get injured and don't mind. These types make good soldiers. The word psychopath has changed in meaning, not all psychopaths are criminals...they just don't respond to remorse or conscience and they can tolerate alot of pain, and don't mind dispensing it too.

3) less dramatic than psychopaths are the low arousal people, who can tolerate more stimulus than others. These people love strange activities like S & M, and dangerous sports, and don't mind getting banged up. They have somehow learned to overstimulate themselves for a dopamine hit. It is believed that these types have lower endogenous daily dopamine and hence have to create it with extreme behaviors. When you see people with impulse control problems, who get "off" on bullying others, who need recreational drugs to feel "better", who drive excessively fast all the time, etc ...these are increasing dopamine in the brain with those behaviors. Reinforcing them, to create a style which they cannot easily break out of themselves, without help.

There are two types of temperature neurons in our hands/feet. The cold ones supercede the heat ones in the spinal tract. That is why menthol rubs cool us and block burning signals. Menthol stimulates cold receptors, and that temporarily blocks the heat sensing ones that seem to be the first to "go" with PN. Menthol does not create cold...just stimulates those nerves specifically.