Nick,
There is a vast cultural difference here than say some Amazon tribe that has little less than a g-string for clothing. The children in these tribes are used to it. They think nothing of it, really, as they were born into that culture. And I don't think the children in these situations are prone to have sex before their time.
But we don't live in such a culture. What we have here in the case of these girls passing pictures amongst each other is not a cultural norm. They know damn well what they are doing. They know that exposing themselves to boys will elicit a response. In some warped way, they are thinking that if they show some skin, the boys will be attracted to them. You know what? They are right. But all this will do is impress upon the boy that the girl is open to anything. But that's not always the message the girls are trying to convey. They just want to be liked.
Now as far as the assertion that God is a pornagrapher, we must understand that God did make us sexual beings. Yes we are attracted to the opposite sex. God made our bodies to be beautiful to the other sex, tis true. Those basic instincts are part of who we are, there is nothing sinful about....as long as that attraction is in the proper context.
Coming from a biblical perspective, the main thrust (pardon the pun) for sex is pro-creation. And according to the biblical paradigm, pro-creation is approved within the state of marriage. That is the formation of the family unit, and the family unit is the stabilizing factor in society.
When society impresses social mores on our young people, the tendancy that it short circuits the process. As a result, the relationship is going to focus on the physical. At such a young age, there has not been sufficient time to develop emotionally, socially, spiritually, or maturely. Teens tend to have a sense of immortality and ego. In this state, not much is considered in terms of consequences. Bad decisions are made, bad things come about from those decisions.
I can remember being a teen. I can remember taking risks. Some of those risks I dare say could have been fatal. I've gotten behind the wheel of a car while hammered. I knew I shouldn't have, but I didn't care. I was out having a good time with my buddies. Sure, I've seen the crash films in drivers ed. Did that stop me? Hell no. Did I almost cause a wreck? Yep. And yet, I was at it again the very next weekend. No sense of responsibility at all.
I fail to see why you are involving God in all this. Calling Him a pornographer is rather obtuse. Obviously, as we go from an infant, to toddler, to child, to adolescent, to teen, to adulthood, our bodies will be in various stages of growth. That is a natural process. Any fixtation of the body before full grown maturity is misguided. God never meant for us to behold the 'natural beauty' of a fourteen year old girl anymore than a six year old girl.