If you leave your clean underwear at home and never wear any, they’ll be certain to be clean when you die, because they’ll be sitting cleanly in your underwear drawer.
Don’t worry, no matter what your undies look like, the EMS responders and coroner have seen worse. You could try wearing only dark and/or “print” undies if you really care. And change them every day.
Don’t get scared and leave marks in them? LOL! Seriously, I have no idea because it’s not as though we can plan when we die to make sure there’s no skid marks in them beforehand,
You may want a “death” friend. This is the person you have throw out your porn/sex toys so your family won’t see them. You will most likely have to pay the friend extra to make certain your undies are clean.
Keep a Mr. Clean Magic Eraser in your underwear or a Tide To Go Instant Stain Remover shoved umm er well, Mr. Clean Magic Pants may be my next new invention thanks to this thread.
Edit: For some morbid reason I was thinking of suicide, in which case you’d be able to prepare beforehand. I don’t think you’d otherwise want to give yourself an enema every day in case you happen to die.