Guys: Why do you stare at girls without any facial expression?

Anonymous
On one occasion, I walked into a mall and a middle-aged guy looked up from his phone just to stare at me. He was not smiling and did not look angry or anything. He just had a straight face and continued to blatantly stare at me.

Another occasion, I was in a grocery store looking at the shelf for some food and a middle-aged guy who happened to look for an item right next to me stares me down once he notices that I'm there. Expressionless face.

(Keep in mind that I am not dressed provocatively in any of these occasions and that I'm minding my own business on all occasions. Also keep in mind that these are hardcore stares... not just a quick once-over.)

A third occasion, I am at college in the cafeteria. And some guy all the way across the cafeteria decided to stare at me straight in the eye. I looked back at him and he kept on staring with a straight face.

I thought if I a guy thinks someone is attractive, his face lights up a little bit when he sees her. I don't understand the expressionless stares that I get from some guys. Why do they do this? If you're a guy that does this, please provide some kind of explanation. Thanks.
Guys: Why do you stare at girls without any facial expression?
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