This may sound silly, but for some enjoying sex is a learned experience. Even if you do not really have the desire for sex, you can learn to think about it and train yourself to enjoy it more.
I was raised in a very religous family and it was very hard for me to go from "No... sex is wrong before you are married." to "Oh now it is okay because you are married." So I would say I enjoyed sex a lot less than most people my age when I got married. What I did was change my mind set about sex. Even though I was uncomfortable with having sex and really had no desire, I kept working on it. I can't say that I enjoyed it all the time, but I saw such a difference in how my husband treated me outside the bedroom once we were having regular sex. I began to think about sex more often, not the exact images of having sex, but the closeness that it brought us. Sounds silly, but I kept practicing until I actually started to enjoy it.
Good luck