What would you say is the common denominator to a woman who is always only getting stared at but never approached?

What would be the general consensus on why that is?

What would you say is the common denominator to a woman who is always only getting stared at but never approached?

Thank you for helping.

Men stare at her consistently because she's really ugly or funny looking.
Men stare at her because they like her looks but don't really want to approach.
Men stare at her because they like her looks but don't really know how to approach. (Men find her either intimidating, unapproachable or seems distant or disinterested.)
Men just like to look but this woman obviously has something wrong with her that makes all men not want to approach her.
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What would you say is the common denominator to a woman who is always only getting stared at but never approached?
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