Siddartha is protective by nature, but everyone who comes over is familiar. I live at the end of my road, so there are no passersby. So his instinct is frustrated, which he has solved in a very aggravating way. My husband comes home from work late, around 10:30, or later during holidays, because he's the head chef of a popular local restaurant with lots of tourist traffic. Every night, when my husband opens the door, Sid barks ferociously(just once) and charges over to Bryan. He always gets a 'time out' for this, but he always does it. Of course the kids are in bed by this time, and my floors are tile, so it's extra loud. I guess the kids are used to it, because nobody ever wakes up. He even does it if he's locked up first, or in his crate. The only way to stop him is by putting him into a down-stay BEFORE Bryan gets to the door, but I don't always hear the car pull up.
He also does the late night licking, but with a twist-he lets out a special little grunt along with the licks, which is reserved only for this activity. (He's neutered) I really don't mind the actual licking, since he can't exactly take a shower, and at least it's late at night when he won't be laying his slobbery lips on me soon, but the grunting grosses me out!
He'll come over near you when his slobber-strings are about 6 inches long, and SHAKE! You really have to duck quickly. My 3 year old son actually goes to get a napkin and wipes Sid's face(soooo gently!) when he sees slobber.
Also, I swear he can bruise your leg with his tail! Ouch! Sometimes when he's 'kidney beaning' he whacks himself in the face with it and you can tell it hurts a lot- and this is a dog with a very high pain tolerance.