I would say it is most likely feces but it could be old period blood. I wear g-strings and can tell you if there is a brown color on the string it is most likely feces. For me, no way it is period blood because I am a man. To answer your question, the string does not go in your butt hole it goes in the crack of you ass. Bottom line is your best friend's mom needs to clean her ass better.
What part of the g string sits in your butt hole?
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I would say it is most likely feces but it could be old period blood. I wear g-strings and can tell you if there is a brown color on the string it is most likely feces. For me, no way it is period blood because I am a man. To answer your question, the string does not go in your butt hole it goes in the crack of you ass. Bottom line is your best friend's mom needs to clean her ass better.