<human>: My long distance GF and I have been having sex for about a year now. She lives about 4 hours away and we see each other once or twice a month for a weekend.

Whenever we get into doing anything physical, whether i'm giving her oral or vaginal, once she gets worked up enough she pushes herself off/away from me.

I know(at least i'm fairly certain) that she enjoys it, but it seems as if the pleasure is too much for her. She gets really out of breath and her feet/legs go numb/shake a little. When she is very out of breath it seems she reflexively pushes away from me.

She has never had an orgasm in her life, never watched porn. She refuses to masturbate. 

I don't know what to think. Is it something in her head?  Is there something physically wrong with her? 

I always end up getting off, and that's great and all, but it gets old when its always a one way thing. I Don't want to stop enjoying the intimacy because she wont let me take her all the way. Does anyone have any advice for this situation?

Give me a shortened version of the text
<bot>: Girlfriend won't let me get her off. It seems like she can't help it. What do I do?