I have never done a poll on vagina depth. But my experience, which is very extensive. Taller women have less depth than short women. And the height of somebody which we did do a poll on as far as penis size, shows that there is no correlation between height and penis size
Deepest vaginal depth, if allowed to receive a penis (a toy or a real thing), can go past the lower part of the diaphragm if the women allowed their organs to be pushed up and out of the way. Think about how much the fetuses pushed their organs out of the way. The flexibility of the vaginal canals have been pushed past 16 inches using cylindrical probes, with a circumference of 5in.