Pussies dont work like that, they stretch through decades, not 4/5 uses. After high stimulation they become more sensitive. If you ever visit a swingers club, you will see girls orgasming A LOT from smaller dicks after big ones stimulation, even more than from the big ones. If you are used to see blacked movies you probably think big cocks makes an never ending stream of female cumshots, that is not true, and most actress are under popper and cocaine. If I would write a top 3 things porn lies, women overstretched and not having orgasms with smaller cocks would be in there (I'm hung, this is not a small dick self affirming speach).
BBCs in novels are the size of a kid, they are ridiculous. Not a single woman in the world would experience any kind of pleasure, most would require hospitalization, torture tools you can see in Brusell's museum of torture are actually smaller than novel BBCs. In order to fuck with novel BBCS, women would need a fucking epidural administration. That means they would need postbirth reconstruction, that is months, and they would run around peeing on themselves.