Do girls never change their bra?

Ryanatix
this may sound a little pervy and I can understand that, but I've noticed a lot of girls don't change their bra fo rlike 4 days. I mean I thought it would be a daily thing like your socks and underwear. is there something I'm missing or are the girls I see just scruffy, because they don't seem it :S
Do girls never change their bra?
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