Rise of the Planet of the Apes is a prequel to as well as a reboot of the original Planet of the Apes series, which begins with Planet of the Apes (1968) and runs through Beneath the Planet of the Apes (1970), Escape from the Planet of the Apes (1971), Conquest of the Planet of the Apes (1972), and Battle for the Planet of the Apes (1972).
A dog will lick human faces as a way of displaying its status, feelings and to find out about the human whom the dog is licking. Dogs lick human faces to indicate affection, be submissive and to sense information.
Humans are often embarrassed when a dog trots over and starts sniffing at their groin, or pokes its snout in their butt. The dog has no idea that placing its nose in these parts of the human body might be offensive to some people, rather the dog is simply seeking information.