Girls, why would you be afraid of a nip slip, but at the same time, be ok with exposing your as*?

I just saw a girl modeling a bikini she liked, because while it made her feel secure up top, it's also a thong bottom, which is essentially showing her ass. Why is she afraid of showing her boobs, but, is ok with showing her ass?

Girls, why would you be afraid of a nip slip, but at the same time, be ok with exposing your as*?
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