Licking my wife's sweaty armpits.
Right from the beginning, I am having an armpit fetish. I like any type of armpits such as hairy, shaved, stubble. Smelly and sweaty armpits is my major turn on. Once in the morning my wife went to my child's school for dropping him over there. I had been slept. I was awakened by a strong smell stuffing my nostrills. I found my wife puffing her sweaty, smelly and unwashed armpits on my nose and mouth. What a huge hard on it gave to me! I couldn't ever imagine that morning time's armpits are so sweaty, smelly, salty and tasty. From that day I always aspire for the monring time's unwashed and damp armpits. What you feel about this? It's not a story, it's a fact.
Your fetish might have something to do with pheromones, but I don't know much about them, so I'm only guessing...
If you're wondering if it's okay to have a sweat fetish, I would say yes. It might be unusual but it's completely harmless. Enjoy!