Another medium that seems to satisfy many women is flowing water. Many women masturbate by running the water in a bathtub, lying down in the tub, and placing their buttocks up against the end of the tub so the running water lands right on their clitorises. The temperature, strength of the flow, and so on can be adjusted to suit the individual. Hand-held showerheads, particularly the ones with massaging jets, are also very good. And, if you have access to a Jacuzzi, you can use the water jets in those.