A campaign group says some Hong Kong schools run by Catholic and Buddhist groups are objecting to safe sex campaign in the campus, saying they don't want words like condom or HIV to be mentioned to students.
"Usually they say will no," said Eris Lau, chief executive of the Hong Kong Aids Foundation.
The schools cannot accept having their students listening to campaign with such words, she said.
"They will need us to delete or erase all 'condom' wordings," Lau said. Campaigners ended up deleting many pages from their slide shows because they referred to things like Aids, sex or condoms.
She was speaking after a survey by the foundation learned that about 50 percent of teens who answered their questions said they didn't use condoms when they had sex.
One in ten of the 500 respondents said they had sex for the first time under the age of 15. A few said they had sex when they were 11.
Lau said high schools should distribute condoms for free to students to promote safe sex among youngsters.
She also said the foundation recommends that sexually active people across all ages should take HIV tests twice a year.
Lau told RTHK's Wendy Wong that even people with a single sex partner should undergo these tests.