Why do girls look down or look away?

Anonymous
I work with electricity so most of the time I wear a hard hat, but there's girls around me all the time at work. Every time I'm at work I see very attractive girls but when I look some look over then when I look over they look away, or some don't even look they and they look down or some do look. Then today I got checked out right in front of me then she look away all of this happens mostly when they walk passed me. Some of this put together is kinda confusing, am I not attractive, maybe impression of the hard hat or something, what does this all mean?
Why do girls look down or look away?
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