Two questions in one post.

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What size girth (circumference) is your penis? If you have a low girth, you may have a 'loose' fit in the vagina, and not get much stimulation.

uncurcumsized6 inch long(6'1) and 5 inch girth

Can you retract your forskin?

Yes, I can retract the foreskin.

Could it be from too much masturbation? I'm sure that sounds insane and impossible, but I must ask.

Not impossible.

I like how "not impossible" yet still insane. lol

It's come up here on the boards that someone has beome too accustomed to the sensations of mastubation, and then, lack enough sensation during sex to orgasm.

oh shit. If I stop, and do it much more rarely, will the sensation come back or is it gone forever?

I'd find it hard to believe it would be anything but temporary if caused by getting too used to masturbation, so I'd expect it would come back, if that's the cause.

I've had a similar problem with a woman I know, and this is without a condom - and I have a thick girth.

In this case, the problem seems to be down to her being too wet with her natural lubrication, so just before we set to having sex we have to 'mop' her out with some kitchen towels.