Okay, excepting the porn mag thing which I got hold of at about age 14, and ignoring seeing similar aged kids nude - I am one of 5 kids and we all ran about .... oh, never mind!
I was 19, second night out on foot patrol when I had to attend a domestic disturbance. Got to the scene and a truly gorgeous, leggy blonde came screaming out of the building, stark bollock naked, into my arms. Only on reflection was the sight erotic - at the time I was scared to death because of the 6 foot plus gorilla that came chasing out behind her!!!
Ah, those were the days.
"Whoa, lady, I only speak two languages, English and bad English." - Korben Dallas, from The Fifth Element
"If history repeats itself, and the unexpected always happens, how incapable must man be of learning from experience?" - George Bernard Shaw