Most Helpful Guy
Well, I don't wear a bra, but from what I've noticed with the women I've been in relationships with, I think under normal circumstances every 2-3 days seems about average. Of course, if you've been doing something where you get all sweaty, it should be washed before wearing it again.
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Most Helpful Girl
Depends what i've been doing or if i'm going out later.
If I am getting changed to meet friends I will most likely change my bra as i'll be wearing something different.
But, if I have stayed at home all day I won't change it... that is of course if I have been wearing a bra which I usually don't at home anyway.