[JackSpratt]

You will need:
An mp3 player, iPod or similar portable music device;
Earphones/speakers;
A butt-plug works best, but anything that you think will carry the vibrations and fill you will be fine.

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What you do:
Use sellotape to attach the earphones to the bottom of the plug, so that the bit you would put in your ears is sellotaped FACING the plug. Then using lube or not, fill yourself with said plug. I mean, really force it in there, as far as it goes, so it really stretches you.

After that... just pick a song with some heavy bass (I find Starlight by Muse works best) and turn up the sound as loud as you can handle! It is a difficult rig to set up, i'll admit, but you find yourself reaping the benefits in no time. Who needs vibrators when you can make one that gets you off to your favourite song?

Enjoy! ^^