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How to get the physical side of a relationship back?

My girlfriend and I have been going out for a year now, but things are cooling off in terms of the physical side. We are in an LDR when at uni, which obviously makes things difficult, but see each other fairly regular especially when both at home. Yet it seems that she seems less interested in the physical side, and she doesn't initiate it as much. We have never had sex (I am happy waiting) but it's the fact that she never talks about it that annoys me. I bring it up occasionally saying that I am here to help you and guide you, and once she agreed we'd try next time we saw each other, but nothing happened.

How can I assure her the physical side is just as important as the emotional side? I don't want to rush her into sex, I just want her to know that I am ready when she is and that I am here to assure her, get the conversation going and stop her fears. I don't think I am being unreasonable wanting to give it a go after a year?