“A lack of proper sex education leading to misconceptions about sex and relationships is the root cause of the high numbers,” said Ferrick Chu Chung-man, the organisation’s executive director of operations.

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He added that avoiding teaching the subject could result in young people turning to less credible sources of information, such as online pornography.

“Teachers we spoke to found that students go online to satisfy their curiosity, such as visiting pornography websites to learn about sex, leading to misconceptions about consent and intimacy,” he said.

The study released on Tuesday, which was conducted between November 2020 and April 2021, was based on the results of questionnaires sent to the city’s 473 secondary schools. According to the watchdog, some 203 institutions filled in the forms, accounting for a response rate of 42.9 per cent.

Among the participating schools, 13.8 per cent said they did not include sex education in formal lessons, while 12.3 per cent told researchers they had not organised any related activities on the subject.

The watchdog also found 90 per cent of schools that taught sex education in the classroom spent 20 hours or less on the topic, while 48.6 per cent devoted five hours or less.

Asked why schools struggled to make time for the topic, more than 80 per cent of institutions cited an “already jam-packed” curriculum for secondary students.

“Most schools only touch on sex education during science or biology lessons that teach anatomy, but that is not comprehensive enough,” said James Chan Kin-sing, the commission’s senior officer for policy, research and training.

“We hope that sex education not only addresses the biological but also the psychological and social aspects, such as harassment, relationships and gender issues.”

Among the schools that taught the subject in the classroom, nearly half told researchers that staff assigned to teach sex education had not taken part in any professional courses, while more than 95 per cent said they did not require personnel to have any prior training.

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Outdated guidelines issued by the government in 1997 advised schools to allocate 36 hours and 30 hours of sex education for junior secondary and senior secondary students, respectively.

A more recent framework, introduced by the Education Bureau in 2021, combined the subject into a curriculum featuring eight other topics, such as national education and drug abuse. However, the new approach did not include a recommended number of teaching hours for each subject.

Under the framework, schools are instead encouraged to incorporate the topics into the lessons for the standard curriculum rather than teaching them independently.

One school principal interviewed in the study said many places predominantly focused on students’ academic performance, with sex education not considered a priority due to limited teaching hours and resources.

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Meanwhile, 60 per cent of schools polled said they wanted authorities to revise the existing guidelines, and more than half called for the government to suggest a recommended number of teaching hours for sex education.

In response to the survey results, Chan urged authorities to amend its stance toward sex education by “reactivating and updating the 1997 guidelines”.

“Although the 2021 framework includes sex education, it is not comprehensive enough. It does not have any recommended teaching hours nor any recommended structure, so it is not comparable to the 1997 one,” he said.