Why do boys that thing in which they look a girl up and down?

Anonymous
there is a guy who walked pass me and while he did that he turned to me and looked me up and down with his eyes. He is much taller than me and was easily able to look down from up there. It was like a scan and happend really, really fast like 1 sec soon as he saw me. I am a girl and 17 and he's 19y i was wearing a grey pencil skirt and a black bandeau top. I am asking myself right know if I looked good or not and why he did that. Or do guys that always?
Why do boys that thing in which they look a girl up and down?
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