CONCERN about the impact on young people of films depicting sex and violence has prompted a call for a new censorship category. There had been a 46 per cent increase in Category II and seven per cent in Category III films shown in the first 11 months of last year compared with 1993, Obscene Articles Tribunal adjudicator Meryvn Cheung Man-ping said. He said the Television and Entertainment Licensing Authority figures showed there was an urgent need to review the classification system. Mr Cheung said in terms of the level of sex and violence there was very little difference between Category II films - classified as not suitable for children - and Category III films - only for those over 18. Technically speaking, anyone could watch a Category II film even though they carried a 'not suitable for children' warning, Mr Cheung said, adding this grey area needed amending. He called for the introduction of a fourth category for people between 15 and 18. This would be known as Category III, with the existing over-18 category renamed Category IV.