The same in daily life. If you are looked at for more than necessary, you will look at yourself up and down, to see if there is anything wrong with you. If nothing goes wrong, you will feel angry toward other’s stare with you that way. Eyes do speak, right?
Looking too long at someone may seem to be rude and aggressive. But things are different when it comes to stare at the opposite sex. If a man glances at a woman for more than 10 seconds and refuses to avert his gaze, his intentions are obvious,
http://www.topchinatrip.com/ that is, he wishes to attract her attention, to make her understand that he is admiring her.