Since I don't know how long you were together prior to being married, it's hard to answer you. Let's assume you had a more lengthy relationship prior to marriage, and were having sex prior to marriage.
In any long term relationship, there will be a difference in sexual desire that will eventually show up...initially, it appears that your sex drives are equally matched, but no couple has equally matched sex drives (really, it's a matter of relativity to each other, even when they are closely matched).
Once the initial passion wears off, the difference in desire will present itself. The trick is to learn how to soothe yourself as the high desire partner when she turns you down or does not initiate. If you press, she will only 'back up' and things will get worse.
So: when you want sex, initiate with courage. If she turns you down, soothe yourself and try again another time. One thing is for sure: you cannot turn a lower desire partner for sex into a high desire partner for sex...the proof is thousands of years of useless potions, pills, and odd things that are supposed to boost sexual desire, but only really lighten your wallet.
I strongly suggest you read the book: "Intimacy and Desire" by
David Schnarch, and visit my website for some free information about this topic at: Gentling.org