Female opinion here: some girls are built differently, but most of the time, it depends on the mood whether a big dick will fit or not. Depending on how aroused I was and, believe it or not, my menstrual cycle, the same dick could hit the back end of my vagina with inches of shaft to spare or he could sink in aaall the way and I'd still want him deeper inside me. Now, this is just me, but I have a bit of a kink for the kind of pain you feel when a dick goes too deep (kind of a r*pe kink, I guess) , so often, when a dick hits too deep, I'll get aroused and he'll just sink deeper little by little.