Women get larger by time, its a fact, thats why its so awful to have sex with a small penis when you have gotten used to the big ones. But in time, we women also shrink. The pussy is a fantastic creation! =)
There are things that move inside there. If a woman is really into it, the cervix will shift and you can go in all the way to the fornix/cul-de-sac. When that happens, the usual result is ecstacy for both partners.