Why is my crush biting his lip?

[Anonymous]

A guy I like, always bites his lip, when I'm around or talking to him. Then stops when I go away but why does he do it?

[Wubs3000]

I do that too when I'm nervous I bite my lip or pick at it sometimes. Its a bad habit prob not good for kissing

[JPresidente]

Some body language experts point to that and say its a sign of attraction.

[Anonymous]

He’s anxious and doesn’t know what to say or do with his mouth.

[Wise4myage]

Might be a nervous reaction?