I was quoting the Church's teaching in the Catechism. I wasn't using those terms, the Church does, but I do agree with their assessment, since I am convinced that the teaching magisterium is guided by the Holy Spirit when teaching on matters of faith and morals. Plus, it is very logical and reasonable. Society's view of sex has become sick in many aspects. 
Regarding childhood- I know what kids do, I was a child once. 
Now it's my turn to jump to conclusions about you: are you saying that children should be encouraged to engage in sex in any way they want no matter their age? Even in pornography? Really?? I don't believe that about you, but see what making assumptions about another based on little fact is unhelpful? Regarding your very last sentence above- I wrote that the level of a person's guilt is mitigated by various circumstances and is not for us to judge. The action-yes, their personal guilt? No.