1)That the average person, applying contemporary community standards, would find that the work, taken as a whole, appeals to the prurient interest; AND
2)That the work depicts or describes in a patently offensive way, as measured by contemporary community standards, sexual conduct specifically defined by the applicable law; AND
T3) That a reasonable person would find that the work, taken as a whole, lacks serious literary, artistic, political and scientific value.
Though porn might meet 1 and 3, the people of this country, through their unwillingess to convict porn producers and through their massive consumption of porn have decided that the second requirement has not been met. Therefore, since porn is not obscene, you cannot do an end-run around the law by going after porn producers with anti-prostitution laws.
The hell we can't.