I remember having a raccoon tail when I was young that I liked jerking off with. That was the late 60s. By the mid-70s I'd found Penthouse magazine and the Forum section with reader letters. In 74, 75 and 76 they published letters by guys with fetishes for long hair, and as soon as I read them, I was hooked on long hair and hair fucking.
Thanks to the internet, there's a lot of great hair videos, models and stories available.