MVAC,
I am so sorry to hear about you guys’ problem. I can sympathize because I had the exact same problem myself, and I know firsthand how frustrating this can be. Your girlfriend probably feels very inadequate and feels like she got ripped off by nature somehow. Whatever you do, do not make this about your feelings right now even though I understand it is very hard for you as well.
The first thing you two should do is to take the focus off the orgasm for awhile. Because when the sole focus of sex is having an orgasm, you feel like you are on stage performing and everyone is holding their breath to see if you will hit the big “O”. So not only do you feel let down when you don’t orgasm, you feel you have let your partner down. This only adds to the problem.
Her problem could be physical, emotional, or a combination of both. You guys should definitely go see a doctor, and try and find one who specializes in sexual disorders. They are few, but they are out there. You should also have her testosterone levels checked. And before you even see a doctor, there are some questions you could address that might help to get you on the right track to finding an answer. For example, can your girlfriend get herself off? If she can not, I will almost bet that is the main source of the problem. Does she get wet when she is turned on? Does she get turned on at all? Does she initiate the sex ever, or is it always you? How was sex approached in her home when she was growing up? Was she ever in a sexually abusive relationship?
Again, there is no one simplistic answer that is going to solve the problem overnight. I advise you to encourage her and really just focus on the foreplay & act of sex rather than the orgasm. Go back to just holding hands and kissing, and work back up to sex really slowly. Encourage her to masturbate when you are not around or to learn how if she cannot already. The flow of water technique is marvelous (mentioned earlier), and that is something she can do on her own and all for herself. But until you guys identify the problem and find the answer, don’t give up on sex.
You must be a very loving boyfriend to put out such an honest post on such a macho website. I am sure with you at her side, you guys will find the answer. For me, it was an emotional thing I had to work through. But for her it could be totally different. Anyway, I wish you two the best of luck and many years of happy, healthy sex!