I have been masturbating since I was 5 years old. In the intervening 50 years, I've developed a number of techniques.
Most of these involve rubber products such as rubber balls, bathing caps and girls' sneakers. I will present one technique per posting. This first technique does not involve rubber, but it is the lead off technique in the series.
My first method of masturbation was to tuck the head of my penis into the skin surrounding the shaft and then humping the mattress in such a way that the head rolled around inside the skin. I was able to achieve orgasm this way without getting an erection. Even though I was capable of erections at this age, having the penis bent at this angle apparently prevented my getting one.