Advice please

We have been together for three months now and have known each other for five months. Our relationship is great, but what comes to the sex, its not that great. 
I knew that he was virgin before me, but thought it doesn't bother me. Now it does, because I have to always make first move. Usually he says he is too tired or stressed out. We have talked about the topic and he said that he doesn't like sex that much. I do, a lot. Other than that, our relationship works fine. 
Any advice? Should I just bare this situation and hope it will get better? I think this is very common problem tho. 

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