I've had a great wank just now, what I did was grip the very bottom of my penis very hard with my left hand while quickly stroking just the head of my penis with my thumb and two fingers with my right for extra sensitivity. I did this 3 times using the stop and go method.
On the third time though, I decided to cum and when I ejaculated, the big load of cum that I was holding in spurted out like a fountain for the 7 ejaculations. I think this happened because of the tight gripping.
I advise you try it, it makes your ejaculation so much powerful and satisfying!
Background to this method:
I was in the bath this evening and I always like to start slow with light strokes on my penis and work my way up to a full jerk, but just pulling the foreskin over the head, though this time to start, I wanted to rub my penis against the bottom of the bath, slowly humping it, something I havent done since I was 13.
While I'm stimulating the head, due to the warm water, my penis grows bigger than it does most of the time normally, to 7 inches or probably more, though i've never actually measured it. I am 6 1/2 inches normally. I love wanking in the bath because it makes my cock big and it feels very smooth.
I'd love to share a bath with someone (m/f) sometime...