I found this technique when I was 14. Required for this technique is something that fullfills your most blissful fantasies (via, something that really gets you hard), it can be anything, its just important that it can be something you could probably masturbate every 5-10 minutes to.
You'll find out why I call it a Personal Geyser. After you have your materials, start masturbating at your usual pace. Get to the point where you're seconds away from setting off, as hard as it may be, stop immediatly. Right when you feel it starting to slip away, continue again. The goal is to continue the peak of the climax without actually cumming.
I'm really not sure how many times you go through this process, (it was a few years ago, as unforgetable as it was), but I know that you may start feeling small painful aches of pressure somewhere on the mid or side areas on your shaft. I felt this too but strove to get a couple more in. Therefore I believe it will only work if you do start feeling these little aches.
Finally, I chose to release. I can't describe the feelings that went through me. It was a bit sore afterwards but damn it was worth it. The reason its called a Geyser is because the one thing I really remember is how much force the cum spouted out. I swear to God, it literally shot about 4-5 inches above my head [the head on my shoulders] from my other head and almost landed all over me.
But know that I only had one of these 'super orgasms' using this technique once. If it were me I would take a day off from fondling, but thats just me and my paranoia with the safety of my member.