@hawkeye10,
Thats not my argument, that's my point of view. I don't care how you raise your children, but when my son drove without a license and damaged two cars you can damn well count on him being punished. I am a responsible parent, I knew my son cocked up and we felt perfectly comfortable making him responsible for his foolish and costly gamble. Perhaps you aren't capable of insisting your children behave. All kids screw up, no one can raise a perfect child and most kids manage to screw something up while they are young.
Your point of view (also not really an argument) is how low can we make the age of consent for girls. We differ on this, because I didn't have children for pervs to fondle or abuse. I understand you don't think its unnatural for adult men to "date" or romance 13 year old girls, I think it's predatory.
Regarding your other thought, I agree it's impossible to prevent 2 14 year olds from sexual experimentation, and even though I don't believe in punishing children for this, I do think parents bear some responsibility to make sure their are no babies conceived while the older children play at being adults. Start by making sure they are tested for STD's and receive accurate information about safe sex.
Even you must realize that all the laws are supposed to protect peoples property, well-being, livelihood. And yet crimes are committed every day despite the laws. As far as the sentence "you did illegal sex, do as we tell you are else we will prosecute it" I hope you are not trying to tie that grammatical abortion to me.