If we count Playboy as porn, then I saw it at age 7 at my friend's house. Her Dad had a huge collection & she'd smuggle some & we'd all look at it in the basement or her room. It f*d up my body image BIG time! But until she moved away when I was 11, we were always in those magazines, LOL! I'm surprised we didn't fool around with each other, but it never occurred to me!
I first saw a porno video after they just came out on VHS. I found one in my dad's desk drawer & whenever I could, I would watch some! I was 14. At least it wasn't anything upsetting that I found, like a kink I wouldn't have been comfortable discovering about my parents at the time, you know?