Think about it like this...
Women, just like men, come in all different shapes and sizes. While the staggering majority fall along the standard distribution of 'size' (imagine a bell curve), there are some that cap each end of the spectrum. It's true for breast, penis and vagina size. So, yes, I'm sure that there are some girls out there that need to practically have a car parked in there to be suffeciently stimulated.
Moral of the story? Don't judge what you don't really understand.