Most people assume that when a person is biting their own lips they are just giving a seductive signal to the opposite sex near them or talking to them.It may be particularly true when there are other clusters of accompanying flirt signals or if they are checking them out while or before biting their lips but it is unsafe to assume that a lower or upper lip biting indicates interest in the opposite sex ,just as a standalone gesture.Although we would picture a woman when we talk about ‘biting lips’ most men also display this body language to express their romantic interest or to show that they are interested and aroused.
Having said that biting lips can mean a lot of other things like fear,anxiety or a suppressing action when it is done outside a seduction setting.Bottom lip bite signifies anticipation as opposed to upper lip bite which indicates apprehension or fear that something bad is about to happen.This makes lip biting hard to read.For example you are checking out a women standing close to you and she kind of bites her lower lip.It may be because she is attracted to you and she is giving flirty signals out.It may also mean that she is feeling uncomfortable in the situation she has found herself in and is anxiously biting her lips.When a person feels anxious biting their lips helps them pacify themselves from the stress. Some men and women may have developed lip biting as a habit and they may repeat it again and again when they enter in to some kind of situation or a mental state of mind.Once you figure out what kind of state they are in then you can always guess the time they enter that emotional state just by tracking their lip biting pattern.
Biting the Upper lip Vs Biting the lower lip
Most people bite their lower lip or the below lip but there are some who bite the upper lip also.Biting the upper lip is not generally considered as sexy as biting the lower lip.apprehension.
So analyze the content and context of the situation you are in before analyzing the meaning when someone in your vicinity bites their own lips . With enough practice you can separate out a seductive lip biting from a anxiety based one.