LEGISLATORS approved a fivefold increase in the maximum fine for cinema operators who allow people under 18 to see Category III films. The current penalty is $10,000.
The Secretary for Recreation and Culture, James So Yiu-cho, said prosecution would only be considered after two warning letters had been issued.
Cinema operators have, however, complained that it is difficult to prevent youngsters from seeing such films.
Instead, the Hongkong Theatres Association wanted fines imposed on youngsters caught at Category III films.
Independent legislator Timothy Ha Wing-ho, who chaired the bills committee studying the Film Censorship Ordinance, said the increased fine sent the right message to the public and the film industry.
''The number of Category III films being shown in Hongkong is increasing,'' he said.