As 
U.K. Internet surfers prepare for major changes to the availability of online porn, U.S. adult entertainment companies are scrambling to determine the potential consequences on their bottom lines.
British Prime Minister David Cameron announced Monday that the U.K.’s four biggest Internet service providers will automatically block access to porn sites for both new and existing connections, unless users specifically request that the filters be disabled. The new measures are expected to be in place before the end of the year.
Chris Morris: Journalist 