Is a woman biting her lip saying she wants you?

Anonymous
If you're talking to a girl and she's looking in your eyes and she bites her lip what does that mean exactly?

If you're talking to a girl and you say something flirty or sexual to her and she looks away/down and smiles/bites her lip what does that mean?

If a girl bites her lip because of you/directed at you that's always a good thing right? But what is she trying to say exactly.

Please bear with me I just like to know exactly from other people what it means even though I can probably guess what it means.
Is a woman biting her lip saying she wants you?
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