BILL DUVALL WANTS TO FIND PORN ON the Internet. He wants to so badly that he pays Stanford University graduate students to track it down for him. Those bright-eyed bounty hunters of smut are efficient, finding between five and 10 places a day that meet Duvall's single criterion: sexual explicitness. On a typical day last week, his free-lancers brought him the Internet addresses of computers that proffered bootleg images from Playboy, erotic bedtime stories and stag party-style X-rated video snippets. All of them went into a kind of address book that has well in excess of 1,000 entries.
But Duvall is...