Oxyboy, I don't think any of us can give you any really helpful advice without knowing quite a bit more about the circumstances surrounding your marriage, and how your relationship dynamic works and has always worked. What did your sex life used to be like, when you were first together?
I'm seeing one of three possible scenarios at work here:
1. In my experience, women lose the ability to feel sexually attracted to men they've lost respect or trust for, or no longer feel emotionally connected to. If this is it, a good marriage counselor should be able to get to the bottom of this without too much trouble, and be able to come up with some practical solutions for rectifying this.
2. Women can become frigid due to psychological and emotional stress, or old baggage, that has nothing to do with you. How well do you really know this girl and her past? (I'll not naively assume you know each other inside and out, just because you're married.) How well do you know her present life, and what's she's currently up against at work and in other realms of her life?
3. Low sex drive can have physical causes. Try having her come off birth control, and using condoms instead. How well does she eat and sleep? Does she take care of her health? DOES SHE USE ANY RECREATIONAL DRUGS??
When my wife and I first started getting serious and thinking about marriage, I lay this brutally frank card on the table, along with all the others: going indefinitely frigid on me is absolutely unacceptable. I told her straight up that I was a very sexual person, and considered sex a very important component of a healthy marriage, for its entire duration. I told her that a loss of interest in sex on either of our parts would always count as a major problem in need of prompt fixing, in my mind. I told her this because she is not a woman with a high sex drive, and because other than one encounter that happened against her will, she was a virgin to penetrative sex when she met me.
I love my wife dearly. But if she were to ever enter a protracted phase of disinterest in sex with me, I would have no problem letter her know that I was not happy with this, and that we needed to come up with a solution, if I was to remain happily married to her. Somehow I don't see this being a problem, though, despite our differences in sex drives.
The key is very clear and open communication about what each other want. Do you and your wife have that? If so, I don't see it ultimately being a problem for you either -- just a bump in the road in the long run. If not, then my advice for you is entirely different.