Sex was great, then we married?

[MrBond]

"She likes it, she just doesn't want it, I think. It's strange, hard to describe. Both of us can have it, one of us wants it badly. "

Then that's your answer right there. SHE has to make a conscious effort to try even if she doesn't feel like it. That is totally out of your control. You can try to encourage, but you can't force it. Try and see if there is something that might encourage her to try.