I don't know for sure but I think when I was 14 when I saw my first adult magazine in school
then I found daddy's magazines (cats, penthouse) and a bit latter maybe when I was 15 first daddy's porn movie (with Ona Zee, I don't remember english title)
damn! damn! It was so fucking exciting
(many many cumshots) heh... but porn doesn't excite me anymore
now only real female can make my dick hard...