Everyone reaches an age of sexual maturity at different times, it would be impossible to create a law that is fair for any and all people. There are kids at the age of 13 who are already mature enough, and emotionally stable enough to have sex, but that doesn't change the fact that the majority of them are not. Therefore it is in the interest of that majority that the legal age is one high enough for at least most to have reached that sexual maturity. Whilst I know it isn't the case, I believe that the age in which you can enjoy adult entertainment should be the same. I realise that kids will inevitably watch it anyway, but certainly to a lesser degree, and they won't be able to enjoy it as much as the sound will have to be all the down and they'll be riddled with guilt 
Well that's my two cents...

Well that's my two cents...