"According to research by Porn Harms, a US organisation, the average age of children's exposure to pornography is 11, but parents and professionals are dealing with exposure issues of children much younger."
Earlier this year, the Federal Court of Australia made a decision on this very question when a senior public servant was sacked due to looking at legal pornography, using his own internet connection, in his own home. The only problem was that the employee viewed the material using the work laptop which was monitored by the employers.