What does it mean if a guy glances at your lips a lot while talking to you?

melissa2
Let's say, a guy and a girl are talking, and while he's looking at her while she talks, he glances at her lips every few seconds, but then looks back up at her eyes. Some people say it means that the person is unconsciously thinking about kissing you, or does it mean something else or nothing at all? Guys personally, what do you think? Cause some guys say it has to do with oral sex...some say it's just a habit.
What does it mean if a guy glances at your lips a lot while talking to you?
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