Why do guys like the girly girls so much?

i dress very scene, like this:

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scene guys tell me I'm hot, but normal guys don't seem to find me attractive because of the way I dress

my sister is a girly girl and dresses like this:

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normal type guys flock to her and tell her she's so cute and dresses really nice.

why do most guys like girly girls?
Why do guys like the girly girls so much?
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