I am not an expert, but most of the time sex problems are not the core issue, but rather a symptom of other relationship problems that are linked to a lack of great sex. You might want to explore the "divorce busting" concepts in the Newcomers or other sections of this website or even the Walk-Away-Wife section, as your comments indicate some really specific issues need to be worked on in your relationship.
I think that you said that you need to create magical sex to make her happy and feel loved. If it is just "sex" that needs to be magical, there are a few books, I would suggest. ....But again, it may be a lot more than just "sex."
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I have read both of the above books and put some of the suggestions into practice. As with all books, some sections of each book are more worthwhile than others. Of the two books, I like the second one better. Another option that I have found to work wonders on my wife, is a plain book on reflexology. There is really nothing like a special half-hour foot massage to warm a woman up.
If you are not into reading, the Sinclair Institute has some pretty good DVD's on sex education. I would suggest their two volume, Great Sex for a Lifetime series or the single DVD, the Joy of Erotic Massage.
Then again if it is just "magical sex," you could probably Google "Tantra" and spend a year (or lifetime) exploring that topic.
