How do I handle this situation?

I feel like I'm wasting my prime on my boyfriend. He says he gives it to me as much as he can, however once a week or 4 times a month just isn't anywhere close to being satisfactory for me. How do I tell him that he is wasting my prime years without being rude or insensitive? Or should I just leave him? We've had discussion about it before several times and every time he ends up saying the same thing. He is unwilling to make any changes or to try a little more to please me.
How do I handle this situation?
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