It turned out that most of the guys out there buying used underpants are quite sweet, and seem relatively normal (with the obvious quirk of loving the smell of musty crotch). The messages I get are generally short and professional.

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Sure, there is the occasional guy who just wants to talk dirty to me and doesn't really want to buy anything, but I do most of my business on Reddit, so if a guy isn't following the rules or gains a bad reputation with the sellers, we can talk to the moderators and have that person banned for being scummy. I've only ever turned down two requests: one guy asked to see my full face, which for the sake of privacy I will not do, and another guy wanted a pair of panties that a man had ejaculated in "at least ten times," with a picture documenting each, um, round. My boyfriend doesn't mind my side business, but he had absolutely no interest in helping me fill that order.

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There's a certain amount of trust that goes into a transaction like this. I usually take payment in the form of Visa/Amazon gift cards, so my end is fairly safe, but I have the addresses of guys with undie fetishes from here to Greece, and the men want to stay as anonymous as I do. Just like the buyers, a seller has to be verified by the moderators, and can be banned for misusing that information. But there's still an enormous amount of good faith involved in giving a strange woman your home address and the electronic equivalent of cash in exchange for a used pair of her underwear. If you can't trust the girl charging you $45 for a pair of striped pink panties she ran six miles in, who can you trust?