So when I'm using my fingers on my partner, I can often very easily reach her cervix. Now I understand that the vagina expands with arousal but rarely do I strike her cervix with regular penetration, even sometimes when we immediately have intercourse after I have felt her cervix with my fingers( and yes, I am longer than my fingers). So my question is, is the cervix responding THAT quickly, or is it possible that my penis is aligned such that it goes beyond/around the cervix in the area I understand to be called the fornix?