I can't speak for other guys.I can only speak for myself.Each of us is unique,so is our demeanour towards the opposite sex. Most times if I find a lady attractive,I will not want to stare at her for too long because I wouldn't want to appear creepy.I may look at her for a brief moment and then look away.If a girl is aware you are staring at her,she may have the idea that you are attracted to her and I don't want her to detect any hint of attraction.Afterwards, I will walk up to her and talk to her.I don't approach every girl I'm attracted to though Insulting a lady to get her attention is low.I know some guys do it.If a guy is attracted to a lady,he may simply treat her like trash or just make the girl"s presence invisible. I fall into the latter category. We call it reverse psychology