Butthole can have a whole range of flavors, bitter, fishy, acidic, etc, determined by several factors like what she ate, when she last took a shit, how thoroughly did she wash. I’ve had anus that tasted like burritos and another like lavender.
Personally I don’t like them sparkling clean, I prefer a faint aroma of shit, not overpowering but I need a little whiff of turd to get hard