Help, My fiance has a low libido?

Have you asked her what she thinks about talking to her doctor? If she once enjoyed sex but now despises it, maybe she has some sort of medical issue or imbalance that has taken away her libido. Whatever the cause it WILL NOT get better after marriage. Obviously sex isn't everything but it is an important part of a healthy marriage. It's something the two of you need to get resolved BEFORE getting married unless you don't mind the idea of spending the rest of life feeling like you're only getting sex out of obligation. What's the turnon knowing the other person just can't wait for you to hurry up & finish?