There is a saying....that sex is a small part of a good marriage, but everything in a marriage when it is bad.
I don't know your age or how long you have been married but sex does wax and wane. That's normal. But if sex is important to one of you, and you are in a sexless marriage, I think that is going to build resentment and could ruin your marriage.
A long time ago I was in a LTR (10 yrs+) and my guy started feeling "brotherly" to me as well. So I bought books, got a new look and spiced things up
It was great, and I felt new attraction, he loved it, and all was good?
It was in a "way". While sex improved, I began to see our real issue, that had been creeping along with us. His lack of effort, while he enjoyed the new me, it was also ALL ME. And I came to find our goals had changed somewhere, I wanted to travel, we finally had reached our career goals, I wanted to climb mountains! He thought that sounded awful, lol. Today he lives a comfortable 9-5 life with his GF, and I went on to do the things I always wanted, a non-traditional life, more adventurous. I think our lives today show how divergent we had become. It just wasn't meant to be, and I am glad we didn't waste too much time figuring that out. What we did have was great while it lasted.
Ok, so my point, if you have a good foundation I believe you can revive your sex life. If you have other issues lurking like I did, dig them up and take a hard look, and fight to reclaim a happy marriage....had I not fought in mine, I would forever regret, I don't today because I really tried back then. That's important.
Good luck to you, Kes