I must also admit this...my baby chick, Ivory, also likes to peck my tongue!
Seriously, if she's taking a nap near my shoulder and if my mouth is open, she'll stick her head right in to peck my teeth and my tongue!
I find it funny, not disgusting. She sometimes eats her poop by mistake but her brooder box is clean and overall she's a clean little baby chick that I don't mind kissing on the head or beak.
In fact I spend so much time with our chickens and other pets and I must admit, sometimes I get a little busy and forget to wash my hands once and a while, yet I am overall healthy and I sometimes get sick and when I do get sick, it's pretty brief and it's nothing serious because I guess I have a strong immune system.
So yeah, I kiss my pets all the time. I kiss our dogs on the head (sorry, won't let them lick my mouth! They will lick my face but dogs put so many different things in their mouths and their mouths/tongues have been who-knows-where...so thy can lick my face but not my mouth! lol), I kiss our chickens and I kiss our Parakeets and our Cockatiel. I sometimes forget to often wash my hands but I'm still healthy and alive today.