This technique is designed for when you have a lot of time to spend on yourself. I bought a spot massager from Brookstone that has a bulbous end on it. I start by putting it on the low setting and placing it right under the head of my penis.
Once I'm fully hard I put on a cock ring and make sure my testicles are pulled through so that the ring is flush against my pelvis.I roll on a condom to help both lessen the vibrations on the head and spread them out along the length of my penis.
I put the vibrator back on low and start it back under my penis head. It doesn't take long before the vibratations start getting me close to coming. When I feel myself near orgasm, I move the vibrator out from under my penis and rub it along the upper side until I'm more relaxed.
Repeat this trick 3 or 4 times until I can't stand it anymore and then I put the vibrator back on the underside of my penis and hold it there until I come in the condom. I find the condom and cock ring duo enable me to shoot a large load and makes the orgasm all the more intense.
If you're in a hurry, subsitute the condom and cock ring for a pair of boxer briefs and point your penis upward. Put the vibrator on your penis head and prepare to cream your pants!