Well, this is telling. I have a few theories on the “no response” group:
They’re terrified of the pulling their arse cheeks apart in case they have a prolapse.
A twisted sense of masculinity prevents them from doing it. It’s all “a bit gay”.
They developed a willed ignorance thanks to some early compliments on the tightness of their arse from early boyfriends.
No point doing it, arsehole like an Airbus hanger.
Do any of those strike a chord with you?