This might seem like a rude question to ask, but while on the toilet earlier it struck my mind and I haven't been able to escape the question. Upon finishing your bowel movement, how exactly do you know or determine that your behind is completely free of any remains? I know in my private bathroom time, I've always been sure to check after I think I've finished, and many a time i have been wrong and needed to continue wiping. Thank you to anyone who is able to answer this for me.