It's all in the mind!
I always had an active imagination, and my early teens were full of acting out my fantasies of encounters with guys and girls who thought like me, though I was never sure whether any of my friends did the stuff that turned me on.
My sexual education was through discovery of my folk's secret videos and magazines, so masturbation was sort of a natural progress.
I developed a fairly normal technique, with clitoral stimulation, leg tension and hip humping that served me well at first. Around the age of 15 I started to try ways of delaying my climax by stopping as the feeling got intense, doing this several times before, I allowed myself to orgasm. Usually with an explosive result.
After a few weeks of trying this, I discovered that my arousal did not diminish when I stopped touching my clit, but continued to increase as long as my fingers continued their stimulating movement in mid air. The distance from my clit effects the intensity of the feeling, but I have orgasmed when my hand is at belly-button distance many times.
All this stopped when I married at 19, but a recent divorce has rekindled my need for 'time with myself' and it still works!
I'm intrigued to know if there is any one out there who has had a similar experience?