i learned at 9 because one day when i was looking for my older brother who was 11-12, i looked under the garage door because it was locked. I looked under the door through the gap and saw my brother sitting on chair doing it. I did not know what he was doing. But I got very very stiff. Later I returned but he was gone. on the concrete there was wet clear sticky stuff. i played with it with my fingers and it made me stiff even though i thought it must be glue or something. I went to our bedroom because i had urge to look at myself nude and stiff in the mirror. So when i copied what i saw my brother do i immediately orgasmed for ages. I did not ejaculate til i was 11.