This is the best thechnique ever. I purchase of those chair massagers for my back. One night I decided to lay it flat on my bed so that I could massage my back while lying down. After a few minutes I turned over and WOW.
This is what you need: tight Spandex boxer underwear, back massager. Make sure your cock is pointing downward inside your boxers and lay the head of your cock on one of the vibrators. It's awesome...
Take it to another level after that: Wait until you have to piss and then lay your cock on the vibrator. It will drive you crazy. You will have multiple orgasms!
Try it and let me know how you enjoyed it.