Despite what the vibrator industry might promise, there's no magic tool that can drive up desire instantaneously. Increasing a partner's desire takes experimentation, trust, communication, and a reasonable amount of risk-taking.
Some of the common problems that many women describe when they report a low sex drive include not feeling loved or that sex has become routine or boring.
Think of what your life would be like if you ate the same thing every day for breakfast, lunch, and dinner. Dull. You should approach your sex life with the same attitude. Add variety. Try new dishes. Sprinkle in some spice. Do whatever it takes to make your sexual palate satisfied (short of trying a new chef, if you're married). That includes trying new positions, having sex in different rooms of the house, or introducing some elements of fantasy.
Here's another way to amp things up: Schedule sex. Many people avoid scheduling sex because it seems as if it would be too forced and would remove the spontaneity that we assume all sex should include. Actually, planning sex can have the opposite effect. Knowing that you're scheduled for a rendezvous with your partner builds anticipation, promotes fantasy, drives up libido, and very often leads to a romp that's hotter than beach sand at noon.