If you're not fortunate enough to have a partner handy, I've found that the "crystal wand" (an acrylic toy in the shape of an "S") is wonderful for hitting the G-spot, and the "crystal G" (an acrylic toy with a bend at the end) is great for reaching the A-spot. Personally I prefer A-spot orgasms to G-spot orgasms if I can't have both at the time.

http://www.clitical.com/gspot_toys.php

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Communication is the key.