More than half of teenagers have been involved in illegal activities in the past year - and one in seven claims to have worked in bars, brothels or massage parlours, according to a DAB survey. The Democratic Alliance for Betterment of Hong Kong surveyed 832 youths aged between 14 and 20 from 22 schools this month. About 53 per cent said they had taken part in illegal activities in the past year. The survey said 14 per cent had worked illegally in bars or in brothels and massage parlours, 26 per cent said they had underpaid while taking public transport, 24 per cent had vandalised public property and 9 per cent said they had possessed or taken illegal drugs. Psychologist Angelis Chan Joy-kong, who conducted the research, said: ' We've found that teenagers who have taken part in illegal activities usually have very little communication with their parents. 'With little guidance, it's easy for the teenagers to be recruited and exploited by triads and get involved in illegal activities.' DAB legislator Chan Kam-lam asked the government to make greater efforts to educate teenagers and to raise public awareness of the problems. 'Teenagers need a lot of money to spend on entertainment and the charges of karaoke and internet cafes are not low,' he said. 'We've found that teenagers who spend more time in those places are more tempted to get involved in illegal activities because they need quick cash to enjoy themselves, and that doesn't even include the effects of soccer gambling. 'The community should provide more activities and facilities so teens have an alternative to karaoke and internet cafes.'