When Are you supposed to change your underwear?

-So lyk my other two accounts got lyk totally suspended fo asking dis question so lyk hopefully I lyk totally don't get suspended cuz lyk omg its lyk totaly lame getting suspended I have lyk 50 other emails and yeah lyk wtfSo lyk you need to lyk stop typing lyk that cuz lyke its rly lyke annoying lyke yeah.You don't need to change them, just take them off now and again and knock them against the wall a few times. Do that about once a month.
panties every day, bhs after sweating (1-4 times a week). and if socks are included, then change them every day, too.
You're supposed to change daily silly.
I usually change my underwear when it gets a bit crusty.
when oldest map of earth appears bit by bit on your underwear
Never. Ever heard of a diaper?
once a year at least