お尻の穴は汚い所なので見せても良いと思ってる子
A girl who thinks it's okay to show her asshole because it's a dirty place.
”Why do you get off on looking at my asshole?”
”It's a dirty place, okay?”
”Here, let me show you the hole.”
”You wouldn't be able to get excited if you saw such a dirty place, would you?”
”What, you ejaculated?”
”Is my asshole... a sexual place?”