See people got it in their head that the 1st amendment is about 'freedom of speech', which is really a very loose summation of what the 1st amendment really is. The first amendment is to guarantee that you cannot be politically silenced. It is to guarantee that you can peaceably assemble, and discuss whatever the fuck you feel like (ostensibly for the purpose of enacting political change). It guarantees that if you choose to espouse something which may not be popular, as long as your speech is not inciting dangerous behavior, the government will not attempt to silence you. If you are attempting to start a riot via hateful demonstrations, it is not protected. If your speech is damaging to another party (such as a political rival), and you do not have sufficient evidence of it's validity, it is not protected.
The problem is that the amendment has been taken too broadly to mean that any form of expression should be protected against censorship. And while I am anti-censorship in all of it's forms, the 1st amendment was not meant to guarantee your right to show pictures of titties on the internet for the purpose of titillation or any other non-political purposes.