actually vaginal ph has a 'bleaching' effect on black/dark underwear. it is normal. if you don't want your underwear to be slowly bleached over time you should wear light coloured lingerie or daily pantyliners. what i don't buy, is that the 'neovagina' has the same sort of natural secretions as a uterus. there's no way that anything coming out of our salamander is anything close to that.
what is really gross, is wearing the same pair of underwear for like four days. even on a road trip, that is unconscionably disgusting. have some self respect, take some spare sets with you or fucking wash for once in your rotten little life.