I understand the original post but I have to politely disagree. I have been wearing thongs since I was 15 and I honestly never have this issue. I even wear a fair amount of white thongs and they are still as white as when I bought them.
Thoroughly wiping yourself is a requirement. And you can’t just surface wipe; you have to “dig” a little (sorry but no other way to state it) to ensure you are completely clean where the strap may possibly ride into. At home, I always have wet wipes in my bathroom to use as a final cleansing to be sure everything is clean and spotless. If there’s any residual excrement, it means I’m not done. No way will I pull my underwear up without being completely clean.
So it is entirely possible to be a 100% daily thong wearer and not have any “badges of honor” left on your underwear. If I did, and they couldn’t get clean in the wash, they would be in the trash the next day. I personally like to have everything clean, and that includes having nothing with stains, especially of this type.
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