it is illegal to send used panties (soiled) in the mail. Yes, tons of girls do it but if you are going to ask your lawyer then you don't need to waste your money asking.
If you want to try to do it on the down-low a lot of girls make good money selling them. I've never understood that fetish cause panties can't small good after being in a sealed baggy for a week. Hell, I've never even been into smelling fresh panties.
lol give me a freshly clean pair after using tide and lots of fabric softener and mmm