Cats who do this were probably weaned too early from their mothers.
G doesn't really suckle, but he certainly headbutts all over my face--eyes, nose, ears, especially and drools profusely as he purrs up a storm. Affectionate? Yes. Lovable? Yes. Gross, too. Lots of saliva drops all over me, with cat hair all over my face. Very itchy now, lol.
Krissy, I don't know how you can stand all that drool. Blech. My ears get soooo wet when G's does this, I can't tolerate his habit very long. And he tends to do this several times a day if I'm at home! :O