I learned about jacking off at an early age while watching my ol' man beat off.
It was sexual as could be for me to watch his cum erupt out of the head of his cock, and I would have powerful dry orgasm when he did. His cock was 8x7 uncut, he told me much later.
He was as horny as a rabbit. Dad and mom were divorced. About once or twice a week our neighbor would come over and they would jack off each other in our garage. They were both about the same age and built just alike cock and ballwise.
I watched them for 6 months when they stopped doing it in our garage.