Because the medical and anatomical studies about the vagina deny that possibility. In just the same that there are no REAL human penises of 10", 11 or 12 inches.
HUGE dicks, HUGE vaginas, etc.. etc... just do exist in porn and in the imagination of some people.
Why do people believe such nonsenses? Because when it comes to sex to believe the strangest and weirdest things can be true it's exciting. :biggrin1:
LOL I am always amazed at how much some people really DON'T know. They think they do, so self-righteously, but they really don't and don't want to hear of anything but what they believe.
I am blessed with very large breasts (36H) on a small frame AND I have a very huge vagina. And some men are far bigger than the poster thinks is possible. Thankfully.