Summary

Portrait of William J. Brennan William J. Brennan Roth v. United States — Opinion of the Court (1957)

However, sex and obscenity are not synonymous. Obscene material is material which deals with sex in a manner appealing to prurient interest. [20] The portrayal of sex, e.g., in art, literature and scientific works, [21] is not itself sufficient reason to deny material the constitutional protection of freedom of speech and press. Sex, a great and mysterious motive force in human life, has indisputably been a subject of absorbing interest to mankind through the ages; it is one of the vital problems of human interest and public concern.
Source: Wikisource

Portrait of William J. Brennan William J. Brennan Roth v. United States — Opinion of the Court (1957)

The federal obscenity statute makes punishable the mailing of material that is "obscene, lewd, lascivious, or filthy . . . or other publication of an indecent character." [28] The California statute makes punishable, inter alia, the keeping for sale or advertising material that is "obscene or indecent." The thrust of the argument is that these words are not sufficiently precise, because they do not mean the same thing to all people, all the time, everywhere.
Source: Wikisource

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