Wow you have it worse lolHaha, unfortunately man, around here, you're going to find a lot of sex-starved people who will shun you for your situation. Even if they're getting laid, it's not in the way they want and certainly not in the way you're describing.
I was in your situation for a bit there, actually. What made it difficult is that she was a highly intelligent woman completely capable of the types of conversations and debates that you're seeking and I was wanting... but all she ever wanted was the sex. She claimed she never knew how fun it was before me, claimed it opened her eyes so to speak and basically it just got to the point where if we weren't in bed... we were off doing our own thing.
In the end, it just got dull for me. It was like masturbation basically - just felt like going through the motions. I had to end it. Sure, I missed it almost immediately and for many nights since, but I never regretted anything. I just imagine the horror that would have been my every day if I would have married her or even worse: knocked her up.
Do what you think is right. I think you already know.