Why are most girls vain? Do you care if someone you're in a relationship with is vain?

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She has pictures of herself on her facebook. That's vanity. There were pictures that weren't taken for the scenery, so she's vain. It seems teens up to about mid 20s do this. She seems nice but I don't know, her, so I can't say if she's really nice but she clearly admires her looks.
I'm not talking about one picture of herself. The pics she takes isn't even about the scenery. It as if she's just taking to get compliments and has excessive admiration of her appearance.
Erica......look up the definition of vanity and vain.....posting random pics of yourself is vanity...there's a difference between confidence and being vain....the fact that she posts a number of random pics of herself shows she has excess admiration which is vanity