I feel your pain and can totally relate. My wife and I have two children, both via Stoli's...but her drive seems to only come with alcohol. Im my situation I know there is some bad history which has not been flushed out and I have not pressed the matter to its full potential since Im not sure Id like what I would hear. It is totally fustrating and in my case I wonder many times if it is something about me. This is a situation the two of you will need to sit down and discuss, along with all the various options. Even if no decision is made, the bug is planted and the subject can be discussed again since it will not be new territory. You know the love is there but the physical manifestation is lacking, which totally sucks.
Keep loving her and do not hold this problem against her and absolutely do not let it interfere with the rest of your daily lives. When the timing is right you need to ease into the subject and have a completely open and honest discussion on your likes and dislikes and what you want and expect. If you come at her aggressively or pointing fingers then you will do nothing but damage. I guess what Im trying to say is that both parties ego's are at stake and you have to tread gently. My wife and I have had several discussions on this issue...not saying they have helped for more than a week...but dont give up. If you need to feel free to email or pm me.