Help: I cant finish my girl friends G spot orgasim?

Hello everyone.

Me and my girl friend have been having sex for about 9 months now and everything is great, she can have vaginal orgasims and we come together nearly every time. We also enjoy oral and heaps of different positions.

Lately I heard about G spot orgasims and have done a bit of research and have tried to give her one with my finger a couple of times (heaps of lube, come here motion) but we run into a problem. She loves it and goes nuts for a few minutes then gets this feeling that she needs to pee, really bad, this is normal so I have read and the feeling is supposed to pass after 10 - 45 seconds with the possibility of her squirting (or not) but the feeling does not pass and she never reaches orgasim. I read that she should relax and even try and push it out because it is not pee, she try's and I feel her trying but it does not happen and she can't orgasim.

I would really like to give her this type of orgasim. How can she get over the feeling of needing to pee?

Thanks...

Hamish.