String thongs and poo stains? (NSFW pic of 2 hot chicks)

[Overfloater]

have you ever "examined" a thong on a "live specimen" before?

":I'm assuming that white string thong goes up her anus/rectum so it's bound to catch some pieces of brown/yellow poo after she has defecated. :"

this assumption is incorrect as it pertains to staining. Its not like thongs are shoved up ass holes , they dont necessarily fit insanely tightly