After enjoying this great site for a while, here is my first contribution.
My masturbation experiences started early, when I was about five or six ears old. I remember taking baths and one time, noticing my penis sticking straight out of the water. As I played with it I found the best feeling came when I used my thumb to stroke the front just below the head. Moving my thumb up and down a line of skin (my remaining frenulum I would learn later) created a wonderful tingly sensation.
On each stroke, my thumb would brush the edge of the head and down to my circumcision scar where it was most sensitive, and back up again. I would continue stroking, increasing the speed. As I did so, the tingly sensation would move to my feet and legs, my eyes would close because the feeling became so intense. I moved my thumb faster, and finally my body tensed and strong waves of the most pleasurable feeling would start pulsing through me. I looked down and saw my penis throbbing, now bright red from the stimulation. It continued to pulse to my increased heart rate, sending little aftershocks of pleasure through my body.
I would do this almost every time I took a bath. Being that young I had no idea what the feelings were called, or about masturbation, just that it was great. Looking back, those were probably the most intense orgasms I've had so far.