Obscenity and pornography are two different things.
Miller v. California set the standard for the former in the U.S.
The basic guidelines for the trier of fact must be: (a) whether 'the average person, applying contemporary community standards would find that the work, taken as a whole, appeals to the prurient interest, (b) whether the work depicts or describes, in a patently offensive way, sexual conduct specifically defined by the applicable state law; and (c) whether the work, taken as a whole, lacks serious literary, artistic, political, or scientific value.