Hello.
The cervix is located at the very end of the vaginal barrel. Once a woman is very turned on, the cervix rises up and out of the way. If a woman isn't sufficiently aroused, the cervix may get bumped by the penis, which can cause cramping/pain. So the solution is not to have doggy-style sex, during which the penis penetrates deeply until and unless your girlfriend is very, very turned on. Or you could try not thrusting so deeply and asking your girlfriend how it feels. Ask her to tell you when it's getting uncomfortable and then try another position. Dr. J
I'm not against the concept; but, I've never been able to tolerate anal sex either.
that can be an uncomfortable position for women, simply because it's a deeper penetration. I find that if i'm stimulated enough beforehand it's easier to be in that position.....