You may know enough not to put a square peg in a round hole, but which of the many available sizes and shapes is right for your vibrator? For every part of your body that you want to stimulate and for all your favorite techniques, there are specialized adult vibrators, including waterproof vibrators to enliven your aquatic scenes. Clit vibrators often feature a soft, rounded head that distributes pressure over the whole clitoral area rather than concentrating it in one small spot. Vibrators like that may not be designed for insertion at all.

Dildo vibrators are of course designed for insertion. Do you want white cock or black cock? An Average Joe or a monster member? Or something small you can drop into a purse?

Anal vibrators feature perhaps the greatest variety of sizes and shapes--beads, eggs, balls, plugs, probes, and dildos with curved heads or flexible shafts to better find their way to your G-spot. The one thing they all have in common is that they work a lot better with plenty of lube.

If your favorite shape is "squishy," then you might want to buy a vibrator made of silicone-jelly that shapes itself to you and not the other way around. What size and shape will make the best vibrator for you? It's probably like what a Supreme Court justice said about pornography: it's hard to define it, but you know it when you see it.