When I ask her if she came she tells me that she doesn’t know...but my guess is that she doesn’t. I say this because I've been with other girls who also push me away at the very last minute because they say its too sensitive and they cant bear it. So I imagined it was a common problem and looked it up. Sure as anything I found other people with the same problem. And the advice they were given is that she should try and stimulate the clitoris over the clitoral hood and not directly. The problem is that that’s exactly what I do. I also finger her and massage her G spot at the same time which she claims feels very good. And also, she doesn’t orgasm during vaginal sex...but I'm pretty sure that’s because the clitoris doesn’t get any stimulation that way.
I also asked her if she gets the same problem when she masturbates herself and she said that she does. What can I do? Its like girls sometimes have this "sensitivity barrier" that block them from having an orgasm at the very last minute. Other theories are that it is because she's not relaxed and at ease enough. But she is! I make sure of that. I'm also not the type who goes straight for the sex. I take my time in cuddling her and kissing her slowly and work my way down very slowly. Any suggestions? I'm sure you've had people coming to you with the same problem. Hope you can help me!

First of all you are to be congratulated for being a caring lover and human being, and for being so diligent and studious. She’s lucky to have you. In order for her to have orgasms, she is going to have to learn to relax, but it may take some time. Because she worries about it as she gets closer and closer to having an orgasm, it becomes more and more difficult for her to relax sufficiently to have an orgasm. It becomes a self-fulfilling prophesy. The one thing I might suggest she try is fantasy. As she’s becoming more aroused, she should try to think about some sexual fantasy and forget about what is actually happening. Perhaps that way she can get over that barrier that keeps stopping her from having an orgasm. If that doesn’t work, and time doesn’t help to relax her either, the two of you should go to see a sex therapist.