The good news is that licking is usually a sign of affection. The bad news is, no one likes to be covered in dog slobber. When your dog licks you endorphins are released that make your dog feel happy.
Dogs also like the salty taste of your skin. If you want your dog to stop licking you, everytime he starts to lick you, you should stand up and leave. Soon your dog will associate him licking you with your departure which is not want he will want and so the licking behaviour will stop.