Pwill - Don't let her say it's your fault, and don't let yourself get sucked into it either. If I was in your situation and she hinted that it was my fault I think I might send her packing. There are a gazillion reasons why she isn't having an orgasm, and I think almost everyone here would agree that it's a mixture of inexperience (on your part and on hers) and nerves.
Keep at it, read up on all the techniques you can find and try them all (give each one a fair chance), make the mood right, make sure you aren't rushed for time, etc.
Encourage her to explore herself and make sure she lets you know when something feels like nothing, and when something feels good, and when something feels <b>good</b>. If she's not letting you know what you're doing right (and I mean by actually saying, out loud, 'That feels great, don't stop!') then you'll try something else. Since you can't feel what she's feeling, you have to rely on her reactions to tell you what feels good. As you get older and more experienced you'll recognize the body language clues (breathing, curled toes and all that) but at this stage it's probably best to say things out loud.
Don't let her make you feel guilty about this. You're trying to do something for her that she can't even do herself. I think I have a few issues with people who don't masturbate but expect their partners to hit the magic buttons straight away. If she doesn't know what she likes, how are you supposed to?
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