A girl posts pictures of themselves in bikinis, that's alright. A girl is seen in a bikini, awesome.
A girl is accidently caught in underwear? OMG so embarrassing! Or say she posts a picture of her in a bra? SLUT.
Can anyone tell me why this is? For the most part, they cover the same amount of skin
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Because they both have different purposes. I know, it don't make much sense but that's it. Swim suits are meant to go swimming in, while underwear is meant to be wore under clothes.