My older stepbrother taught me about masturbation when I was about 7.
I was so jealous that my stepbrother could cum buckets. I was 8 or possibly 9 when I made my first spunk and I was so excited, even though it wasn't very much. I made the mistake of telling him and he made me prove it on the spot.
He grew up to be the (very) proud owner of an absloutely perfect 9 incher with balls even bigger than mine.
I never did thank him for the lessons.