I agree with the idea that the vagina is elastic and can push out a baby and return back to it’s original state. However, with my wife, after having regular sex with her very well endowed bull, I can tell things have changed. I wonder if it’s mental…my hypothesis is that when she gets turned on, her pussy anticipates her bulls large cock, and expands to accommodate, even if it’s my cock, and not his. This gives the illusion that her pussy is permanently stretched, but really it’s just her pussy getting ready for that large cock she craves, and providing access to her posterior fornix. Just my thought.