How long do you have to be
Lets say that for a particular woman in question, her vagina measures 6.25” from the opening to the deepest point in the posterior fornix. Your penis measures 6.25”. How much longer do you need to be than 6.25” to stimulate the CDs firmly? Would an extra .25” be enough to hit it firmly? Or do you need even less than that or even more than that?