my GF often has a hard time taking my cock all the way to the hilt, but every time she is in one of "those" moods, where she is "on-a-mission-to-get-some-big-cock" kinda moods, I don't know if she is just more motivated or what, but its times like those where nearly every inch of me is being enjoyed by her, and depending on the of position, I may even get my entire cock inside of her tight little pussy. I'm a "big" guy and she's a "small" girl, so its usually a struggle, but either way its fucking amazing! I'm no expert in the female anatomy, but I'd say its safe to say that the more she is in the mood, the more she can take.