It all comes down to how aroused a woman is, and for how long she is aroused. When a woman is just starting to get turned on, vs when she's been highly aroused for a half hour, her parts look different. The cervix will tuck itself higher up, the vaginal wall will elongate, and its very interesting to me because as a man with a larger than average penis, you need to have a good understanding of how the woman anatomy works in order to please a woman properly. In times where my girl and I have a quickie, and its rushed, there is just no where for my dick to go, because she hasn't elongated enough. And other times, when she's super turned on, and I've spend considerable time warming her up, it would appear that I can push in as far as I'd like to go and she can handle my size easily, and its extremely pleasurable for her... I wish I would have known this stuff in high school... Man I had no idea what I was doing when it came to pleasing a woman! They don't teach this stuff in school, and they should! Her pleasure has to come first, otherwise, whats the point? The sex isn't going to be good.