not so. biology and exercise of the kegel muscles have a lot to do with it. some women are just built small, some women are just built big. as for the big girl/small girl connection, you may be referring to the labia majora, which is basically sensitive fatty tissue on the outside (outer lips). these do vary a little more in size based on body fat percentage, but also, not necessarily. when i got really thin, i still had large outer labia. it's a family thing.
