The next time you see her, walk up to her and say, "Hey baby, I am glad that you dig my clavicle. I got over 200 other bones for you to feel, if you like."
Run away. Otherwise you are gonna wake up in a bathtub full of ice with your collarbone missing. Also, she wants to sex your friend.
She's a vampire and somehow the scent of your blood has brought on an appetitie. She's looking for her next meal, be cautious... very cautious.
In my country any woman who show collarbone is prostitute. Any man who show collarbone is strong leader like ox.