I was a self taught solo secret masturbator for the first 20 years of my masturbating. Circumstances arose where I needed to take advice regarding my masturbating. This was in the UK in the years just before the Internet.
Quite a lot of gentlemen, and some ladies, were offering advice and treatment regarding masturbating in special sexual interest contact magazines. Opinions at that time ranged from severe disapproval and painful treatments to curb masturbatory tendencies through to sympathetic understanding and encouragement of continued frequent masturbating.
What was common to most of these masturbation therapists was a detailed knowledge of the responses of the male body’s sensitive areas to various types of rhythmic stimulation.
In other words, the masturbation experience was not regarded as just stroking the penis.
There are lots of links, physically, between the penis and other potentially sexually arousable parts of the body.
Anyone interested in masturbation studies?
more at: (91) Serious student of masturbation techniques? – Onania Masturbator Forum