There are many other benefits you enjoy when joining snifffr. This includes free registration, staying anonymous, freedom of choice, wide selection and great opportunities. All you need to do is sign up to buy used panties or to sell used panties. For more information, take a look at our FAQ’s page. Used panties sellers should visit Tips to Sell Used Panties or the How to Get Started page on the snifffr website. snifffr is the trusted marketplace for used panties for sale, used underwear for sale, used underwear, used women’s panties and selling used underwear. Women do very well when they sell worn panties.