The four major ISP's in Great Britain will institute an 'opt IN' policy for porn following a government report and initiative on the effects on children. People using these service will not have access to pornography unless they ask for it.
http://www.guardian.co.uk/society/2011/oct/11/pornography-internet-service-providers
http://www.guardian.co.uk/society/2011/oct/11/pornography-internet-service-providers