The internet has been at the forefront of the war on obscenity for quite some time (basically since it's inception). While the internet makes it easier for the transmission of pornographic images, it serves many other purposes. The internet isn't just for porn, right?! By making attempts to rid the internet of adult sites will make the internet a child's world. While children should, and certainly do have juvenile geared sites the internet can not be made for children only.
As mentioned previously, the limits and standards of decency or obscenity are too arbitrary. Who decides what is indecent and what is not? In most cases only a few decide for everyone what is considered obscene. That is an awful lot of power given to a few which has an effect on many people. When those people decide to arbitrarily place limits on freedoms then our rights are being trampled upon. I understand that protecting children is of the utmost importance, but there are better ways to do so that will not impede our 1st amendment rights.