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I can actually confirm the OP pic with the posterior fornix thing. I'm just over 8 inches and when I was a teen I had trouble with women and the pain I could cause because I was inexperienced.
If you can actually reach the posterior fornix you're golden. You don't need to pump and smash it like a monkey but if you can reach it light strokes while you're already deep or simply grinding back and forth will make women cum hard as fuck. You will make them sound out those guttural groans you hear when you know they're getting fucked good.