When a girl hits on a guy it can be perceived in many ways. Sometimes it is delightful and invited. Sometimes it is perceived as stalking or desperation. Being a chick is not as easy as it looks, guys.
A customer accused me of harassment because I was "staring at her breasts". I wasn't, I had been looking in the wrong direction testing an LED light and was dazzled. All I could see was pink and green spots, so if her boobs were behind the spots I was unaware of it - just trying to clear the after image.