i was about 13 when i found my brothers mags. grandad apparently gave him the box full. erika eleniak omfg. then one day there was a vid in there. i was home alone so popped it in. blew my mind. girls just bending over for the biggest hardest cocks i'd ever seen. i'd caught dad pumping into my mom before, but never anything like this. and then watching four guys cum all over the girls face. craaazy.
To be honest, I feel that once a kid has reached the age at which they can appreciate porn & relate it to their own sexuality, then they are old enough. Unless they categorize different levels of porn (i.e. Straightforward Amateur is hardly in the same category as Hardcore S/M), then screw legal age limits. Furthermore, in the U.K., at least, the age of consent is 16, when they can legally get married, yet they have to wait another 2 years before they're allowed to buy a copy of Playboy, or similar.
even if my uncle didnt have the playboy channel when i slept over their house. there was a small patch of woods at the end of my block maybe about an acre. and all the bums and kids would hang out there so whenever a bum left a magazine there all us kids would jump on them.