Most guys are fixated on the length of their dick, but during penetrative sex, girth is a very important factor too. You say you're "thick", but what does that mean? C-cell battery thick? Red Bull can thick? Coke can thick?
As radar has said, it could be that the arrangement of your girlfriend's internal anatomy means that you're bumping against her cervix when you thrust. I don't have a cervix, but from what I've read, I suspect some women find that as uncomfortable as a guy finds it when something is whacking against his balls.
If that's what's going on, then it could be that you just need to alter the angle of your thrusts a little so that, rather than bumping into her cervix, you're sliding across it.
Also, just as there's quite a bit of variation in the length of men's penises, the depth of vaginas varies somewhat too. Most women can easily accommodate the full length of a six inch penis, and when a woman is sexually aroused, her vagina elongates. But it's possible that your girlfriend just has a vagina that isn't all that long.
Of course, one very simple thing you could do would be to have her on top. If you did that, she could tilt her pelvis and move in whatever way felt best for her, and you'd get some clues about the angle of approach and depth of thrusts that she enjoys.
The fact that you say she gets uncomfortable after a while suggests that lubrication could be the issue. You say her vagina doesn't feel particularly tight, but the pressure sensing nerves of the skin of the penis shaft aren't all that sensitive, so you shouldn't trust your feelings on this point. If you have a fairly girthy penis and she has good PC muscle tone, then you may well feel very thick to her. If she says you're big, then as far as she's concerned, you're big, and that's all that matters.
If a couple doesn't use lube, the woman doesn't lubricate all that much and the guy thrusts very vigorously for more than a few minutes, it's possible for micro-abrasions to occur at the entrance of the vagina. Since I'm a guy, I have no idea what scrapes there might feel like. But I suspect it's not that different to how it felt when, in my jerk-off-obsessed youth, I masturbated so often and so roughly that I ended up with abrasions on the skin just below my glans. If you've ever experienced that, you'll know how intensely uncomfortable it feels when something rubs on a damaged area of that nerve-rich skin.
Something else you need to know is that only a minority of women are able to reach orgasm from penis in vagina thrusting alone. For most women, the position of their clitoris relative to their vagina means that an object moving in and out of their vagina simply doesn't provide enough rhythmic stimulation to the clitoris for them to come. If your girlfriend doesn't lubricate much when you're having PIV sex, it could well be that she isn't actually enjoying it all that much, and it's something she's doing mainly for your benefit. It's possible that if you took more time in the run-up to insertion of your penis and used your hands or mouth or whatever to make sure she has at least one orgasm before you go in, she might be sufficiently aroused that she would get a lot more pleasure out of the PIV part of sex, she'd lubricate a lot more, her vagina would have elongated to some degree, and the problem you describe wouldn't happen.
I think I am hurting my GF
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Most guys are fixated on the length of their dick, but during penetrative sex, girth is a very important factor too. You say you're "thick", but what does that mean? C-cell battery thick? Red Bull can thick? Coke can thick?
As radar has said, it could be that the arrangement of your girlfriend's internal anatomy means that you're bumping against her cervix when you thrust. I don't have a cervix, but from what I've read, I suspect some women find that as uncomfortable as a guy finds it when something is whacking against his balls.
If that's what's going on, then it could be that you just need to alter the angle of your thrusts a little so that, rather than bumping into her cervix, you're sliding across it.
Also, just as there's quite a bit of variation in the length of men's penises, the depth of vaginas varies somewhat too. Most women can easily accommodate the full length of a six inch penis, and when a woman is sexually aroused, her vagina elongates. But it's possible that your girlfriend just has a vagina that isn't all that long.
Of course, one very simple thing you could do would be to have her on top. If you did that, she could tilt her pelvis and move in whatever way felt best for her, and you'd get some clues about the angle of approach and depth of thrusts that she enjoys.
The fact that you say she gets uncomfortable after a while suggests that lubrication could be the issue. You say her vagina doesn't feel particularly tight, but the pressure sensing nerves of the skin of the penis shaft aren't all that sensitive, so you shouldn't trust your feelings on this point. If you have a fairly girthy penis and she has good PC muscle tone, then you may well feel very thick to her. If she says you're big, then as far as she's concerned, you're big, and that's all that matters.
If a couple doesn't use lube, the woman doesn't lubricate all that much and the guy thrusts very vigorously for more than a few minutes, it's possible for micro-abrasions to occur at the entrance of the vagina. Since I'm a guy, I have no idea what scrapes there might feel like. But I suspect it's not that different to how it felt when, in my jerk-off-obsessed youth, I masturbated so often and so roughly that I ended up with abrasions on the skin just below my glans. If you've ever experienced that, you'll know how intensely uncomfortable it feels when something rubs on a damaged area of that nerve-rich skin.
Something else you need to know is that only a minority of women are able to reach orgasm from penis in vagina thrusting alone. For most women, the position of their clitoris relative to their vagina means that an object moving in and out of their vagina simply doesn't provide enough rhythmic stimulation to the clitoris for them to come. If your girlfriend doesn't lubricate much when you're having PIV sex, it could well be that she isn't actually enjoying it all that much, and it's something she's doing mainly for your benefit. It's possible that if you took more time in the run-up to insertion of your penis and used your hands or mouth or whatever to make sure she has at least one orgasm before you go in, she might be sufficiently aroused that she would get a lot more pleasure out of the PIV part of sex, she'd lubricate a lot more, her vagina would have elongated to some degree, and the problem you describe wouldn't happen.