Why do you keep looking at a woman you barely know?

Hello, mga Ginoo! I have a question lang. What usually goes through your mind when you find yourself looking, stealing glances or staring at a woman? You know she’s married and you’re basically strangers. You just happen to cross paths often because you work in the same building. Bakit kayo tumitingin? Is it attraction, curiosity, familiarity or just an unconscious habit? Thank you!