What people are missing here is that they are
both enjoying the sex, they're just not enjoying the penetration as much as they could be. Our poor original poster has said this several times, but everyone keeps assuming he just can't make his woman orgasm. We assume that because it's a problem we ourselves have had. :p
Avenge wrote:Well, the problem isn't really that she can't get an orgasm..
It's more, that she doesn't 'feel' my penis when I'm in her..
She should do Pilates or Stronglifts.
No, I am not joking.
When a woman is sexually aroused, her vagina naturally relaxes and opens up. So don't be upset that it's not tight, that means she likes you. If she didn't like you it would be very hard to penetrate, tight and dry. But if she can learn to contract and relax it, she can adjust things to her own comfort level. And you may enjoy it, too

Pilates in particular focuses on "core" strength, lower back, abdomen, and what's called the "pelvic floor." Stronglifts 5x5 builds this up, too. Think of your own penis, it doesn't just pop out of the body, but runs along underneath between your thighs towards your bum. That part there is your "pelvic floor." Do a squeezing motion as you would on the toilet, you feel it tense up.
When a woman does that same motion, her vagina tightens up. Core strength exercises help her do this, so she can adjust the tightness of her vagina to give her less or more sensation, opening and closing it like almost as well as a hand.
Pilates or Stronglifts, either will work. Or just google up "pelvic floor exercises" and see what comes up.
You're talking to each-other, and you care about her pleasure. That's the problem 90% solved already. Trust me, talking and caring is not the most common thing, unfortunately.