Hey! No one has answered my question yet!
I’ll lift the pointing & laughing restriction if I can just get an answer. 
Peppermint oil, as I understand it, has a fairly low evaporation point, much like rubbing alcohol (except tastier and not as bad for you in small doses). So when it comes in contact with a warm surface, such as flesh, it produces a cooling effect.
Form your own conclusions.
So then, if I decide to (ahem) administer a bit of oral pleasure to my husband, but pop an Altoid first, he will have the sensations of a) the warmth of my mouth, and b) the cooling of the peppermint? Am I going in the right direction with this?
Interesting. Verrrrrrrry interesting. Heh.
People have different levels of reaction to mint on the skin… especially in their personal regions. What is a treat for one can be like being lit on fire for another! Using mint of any kind for oral pleasuring should be tested carefully before “going to town.”
Do take Sassy’s warning into consideration, but yes, Persephone, you’re on the right trail.