i certainly remember: i was 12 or 13 years old, sitting in the shower and jerking my cock. i did that for one or two years than withaut an orgasm. was just fun. then there was a new and very strange feeling in my body and suddenly white stuff shot out of my penis. though i knew, what happened (i read german teenager magazin "bravo"), i was a litle bit shocked - for about ten minutes. then i did it again.