All of our dogs have been inclined to lick us – our previous corgi mixes, Gypsy, and both B's.
I know dog behaviorists do say it is a domination issue, where the dog is showing that you are the subordinate.
I just think it's gross, and always teach my dogs, "No Lick". I don't let them lick people. I know I'm in the minority here.. I probably stand alone. And that's okay by me!
Actually that is a fairly discarded theory at this point. Most behaviorists think it has way more to do with affection (or just plain cleaning) than domination. In all of the social animal groupings you can find lower status individuals groom higher status individuals, not the other way around (except moms grooming babies, and that is because they are dirty)
That certainly doesn't mean you have to allow your dog to lick you, though…of course that can be really irritating. We teach our dogs "enough"...cause I don't mind a little licking..and Tim hates it