I found that article extremely annoying. Why is it a bad thing to be concerned about pornish clothes for young girls (which last time I looked, were not in the least rare and marginal, but mainstream and in your face), and why on earth would that mean someone was not also concerned about the effect of porn on slightly older children? These are two facets of the same thing - ie over sexualisation of everything (aka normalization as others have said). There is no dichotomy in my mind, I find both very concerning.
But then I also slightly wonder at the age of the writer - I have no intention of having a "squirm making sitdown" conversation with my children as teenagers - that's the sort of thing my parents might have done (well actually they didn't but their contemporaries did) and they are in their 70's. I have already had many conversations with my children about sex, relationships, treating other people with respect etc etc. I don't understand why you would need a script to talk about porn either - I have talked to my children about being careful what you look for on the net, as has their school, and they are nine and ten. I have no expectation that the government (or even Google, Microsoft or Apple) can or even should protect my children, and I also know enough about the internet to know that unless we want to have severely limited access like China then it is probably not possible to turn any switch off.
In any case the forefront of porn in the mainstream to me was always the Sun's page three girl, and that has been around for a hell of a longer time than the internet. Cheap holidays (sun and sex) and cheap booze are also as much of an issue with young people behaving irresponsibly, and the rates of teenage pregnancy (whilst still far too high) are coming down not up, plus in other countries with exactly the same internet access to porn have much lower rates.
Some of the other things in this article I do agree with, but it's just too hysterically shouty for me.
Finally are young men so influenced by porn (which they must understand is hardly real - the young people I know are very media savvy) that they totally ignore all the girls they have grown up with who are as real and human as they have ever been? That would make me worry that we aren't bringing our children up very well.