For those that let dogs lick their face and mouth just remember a Dog licks his ass, then licks your face ......
He’s trying to get the taste out of his mouth. If he licked your face, and THEN licked his ass, well...
Old roommate’s one English Lab (the “pick of the litter”) routinely would eat steamy turds he and his brother (the “runt” of the same litter) would deposit in the yard. The brother didn’t have this behavior at all.
Needless to say no kisses here.