I don't know why, but I find great pleasure in licking cold metal objects (unless it's rustic).
The taste of it is so unique, so pleasing.
It tastes like something out of a dream.
If I was to guess why, then I'd guess it's probably because it has a similar taste to blood from my mouth, and whenever I hurt my mouth and it bleeds, when I lick it it goes back inside my mouth, so I think my body thinks the blood is coming back inside, and that's why it tastes good.
I know many find the taste of cold metal someone good, but I find it to be one of the best I ever tasted in my entire life.
I can't even describe the feel of my tongue pressing against a cold metal sheet.
So, cold metal tastes absolutely delicious and very pleasing.