Legal definition of obscenity: the average person, applying contemporary community standards" would find that the work, taken as a whole, appeals to the prurient interest, the work depicts or describes, in a patently offensive way, sexual conduct specifically defined by the applicable state law, and the work, taken as a whole, lacks serious literary, artistic, political, or scientific value.
The jury gets the final call.
In the case of an International medium like the Internet, do you apply the standards of the most restrictive communities, least restrictive communities, or the average?