I have 2 dogs in my home. A female pom and a male chihuahua. The female only licks if someone has just slathered themselves in yummy lotion. The male only licks for the same reason the female does and occasionally he can be a sneaky toe licker. They both know that I routinely lotion my entire body after I shower at night so they wait for me on the other side of the metal baby gate in the hallway. When I walk out they immediatly attack my bare legs with thier tongues and chase me while I swat away at them. "NO!" apparently doesn't mean the same thing in dog.
HOWEVER, of my mom's 2 dogs (male australian shepard & female bulldog, boxer, pit mix) one is a serious licker while the other only licks himself. When I take the kiddos over to visit I have to make sure to watch my little guy especially carefully. While Baily (the bully breed) is a sweet, baby loving, girl she is obsessed with doing what I lovingly call, "walk by lickings" to ds while he sits on the floor (or in my lap, or on the couch... or anywhere). She waits until she thinks no one is paying attention then washes every inch of his skin with her giant tongue in just seconds! I'm glad she's so gentle but, I'd rather my kids get their baths in a bath tub with plain ol' soap and water. Dd gets a good slobber from Baily every time we visit but, ds takes the brunt of it since his defence skills are lacking. I have no idea why she does this. She licks everyone reguardless of scent, gender, or hygene. If you let her continue for any length of time her eyes start to roll back in her head like shes in some sort of trance.