How often you change your underwear or undies?

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I used to wear sando and boxer shorts when I'm in home or in the office,or in any place.But I see to it when I'm in home after office hour or some place I change what I'm wearing specially my underwear.This is one of my personal hygiene that I used to do in my everyday life.We must implement this kind of stuff in our lives.And this kind of personal hygiene will protect you from decease specially from skin deceases.So people how often who change your underwear or undies?