It sucks, huh? For both people- one person is all worked up and ready for more, and you're getting more sore by the second and hoping they'll finish off before you have to tell them that you have to stop. And of course, I would still be having fun if I wasn't in pain.
I dated a couple jerks who didn't give a fuck how it felt for me, and when I told them that it was hurting, they would just ignore me and hold me down and keep at it. Then they would get mad at me for not getting out of bed all day because it hurt too much to move. Ass holes.
As for the OP - sounds like you have the same problem with your girl friend wanting to go longer or more often, and you want too as well, but it isn't feeling good because you're sore from too much friction.
There isn't anything you can do except use lube, though that never fixes the problem for me, it just makes it comfortable for a little longer. Though maybe since you have a penis, it will work better for you.
Also, are you using a condom? Maybe try some different condoms? Or if she is on the pill and you are monogamous, don't use a condom. If she isn't on birth control, you could ask her how she feels about it. I used to take it and it was great because we didn't have to worry so much about getting pregnant, but the last time I was on it I stopped after a month or two because I started having side effects.
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