In the vein of the nipple post, there are also ears. I don't mind mine being played with, but really it does not do much for me. I think tongues and orifices generally make great mates, except for the ears.
It is absolutely disgusting to stick a tongue into an ear. Yuk, yuk, yuk. I don't want your wet slobbery saliva in my ear and nor am I going to clean the ear wax out of yours with my tongue. If you are a 20 year old, handsome, hung, muscled Adonis, I still ain't doing it.