I have seen this somewhere, but only recently I have noticed th is phenomenon. I am in a mall or something, doing whatever, some woman(or a group) come close to me(2 or 3 meters away) but say nothing, only look at me sometimes but in a covertly way(some vague look, sometimes a little smile, like she is happy with something , not "I want you to fuck me right now" look) . She wants me to approach?