This is an oldish thread, but while I agree that 4" should be adequate in most cases, it's sometimes a factor of female anatomy. I know a couple of women with particularly fat vulvas. They can spread their legs wide open and you can't even see inside. They literally have to hold their folds apart to receive oral, etc. While both of these ladies were technically overweight, they weren't the biggest women I've seen by a long shot. It's just how they were built.
The answer is to just hang out with ladies who've got skinny pussies. (Or flat-butted dudes, depending on your tastes.)
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