Ever since humans learned to speak, one of the first things that come out of their mouths is the words, "lick your lips." This simple action has been interpreted as a sign of interest, sexuality, and many other things. Licking your lips generally means that you're interested in whatever the person is saying and that you're looking forward to hearing more. This act is often used in movies and TV shows when a character is being coy or when they want to make a sexual statement. Across all cultures, people use the gesture to communicate different messages. In some parts of the world, it's considered respectful to lick someone's lips.