1) Have you ever had piss in your mouth?
Yes. One of my top kinks is having a woman sit on my face while having a piss, and then making me lick her pussy clean. Yum 
2) Have you ever had someone saliva in mouth? (exclude kissing)
Yes. Another kink is having someoen spit in my mouth.
3) Have you ever had poo in mouth?
No. Came close when a partner had taken a dildo particularly deep up her arse. Noticed just before i licked it clean that there was a bit of poo on it.
4) Have you ever had sock in mouth?
No
5) Have you ever had feet/toes in mouth?
Yes. Not my favourite thing in itself, but there is something nice about the submissiveness of it
6) Have you ever had panties in mouth?
Yes. Prefer if they are pissy - stops the mouth drying out too much
7) Have you ever licked a shoe sole?
A couple of times.