I somehow out discovered and indeed masturbation completely organically, like a less erotic version of The Blue Lagoon.
Having never heard or had anything explained to me the constant erections led to severe agitation, rubbing up against furniture before discovering the purpose hands were made for.
I think I started pretty early because nothing came out when I climaxed for a couple of months. When liquid started squirting out of it I thought I'd broken my penis but was too embarrassed to confess how I'd done it. So I tried to quit the solo action instead. Think I lasted almost a day before deciding it was worth a broken penis and I'd worry about the consequences of this at a later date.
I spent a significant amount of time under thus illusion before hearing a conversation in the changing rooms after swimming at school which set my mind at ease.