Butt flossing

Many people believe that dental floss serves only one purpose, but I have found an alternative use. While my girlfriend uses dental floss to floss her teeth, i like to use it to floss my butt. It feels so good between my cheeks, especially the flavored kind. The spearmint is the best, it makes my ass feel fresh and clean. (Though it does cause burning sometimes). I usually do this at night before my girlfriend and I brush our teeth. She doesn't know it, but when she asks me to hand her some floss it is actually the floss that I used to clean my butt. Essentially it is booty floss. I know its wrong of me, but I can't help myself and when I watch my girl floss her teeth with the floss from my buns, it makes me feel soooooooo good. How normal is this? How else should I keep my butt clean?