How Prevalent is Censorship in U.S.?

That’s because some pornography is considered “obsene” and thus not protected by the First Amendment. Now, when is some expression obscene while others are not? Courts ultimately make that determination, based on the three-part test set out by the Supreme Court.*

One of the prongs of the three-part test I mentioned above considers “community standards” in determining whether the average person would consider the material appeals to the “prurient” interest – so yes, community standards are a valid factor when considering whether expression is protected by the First Amendment.

*Trivia note: when the Supreme Court first began taking cert and reviewing the obscenity cases, the law clerks had to set up film projectors (this was pre-VHS days) for the Justices’ viewing (cite: my former con law professor).