While the First Amendment does not protect obscenity, its interpretation and application have evolved over time. The question remains as to whether or not certain behaviors should be protected under the guise of free speech. Sure, some people may argue this filth should be protected, but the overwhelming majority of fathers would find it reprehensible and would vehemently oppose their children being exposed to it. To hell with the majority, though.
A sane man, especially a father, sees this and experiences involuntary physical reactions - cringing, looking away, feeling uneasy in the stomach, or all the above. These reactions are deeply ingrained in our nature and no amount of cultural conditioning can erase them entirely. The only recourse for those in power is to threaten the livelihoods of men who dare to voice their dissent, and unfortunately, this works very well. So for now, many of us bite our lip and focus on protecting our own children while regrettably, children without such fortunate protection will continue to suffer.