In teaching materials it released last week, a module titled adolescents and intimate relationships for Secondary Year 3, suggested that teenagers who wanted to have sex with each other could "go out to play badminton together" instead.

The materials also include a form called "My Commitment" aimed at getting "young lovers" to attest that they would exercise "self-discipline, self-control, and resistance to pornography".

The new materials have raised eyebrows and attracted criticism for being "out of touch". But officials have defended the decision.

Meanwhile social media has been flooded with jokes centered around "playing badminton".

"FWB [Friends with benefits]?? Friends with badminton," read one comment on Instagram that had more than 1,000 likes.

"In English: Netflix and chill? In Cantonese, play badminton together?" read another Facebook post which was shared more than 500 times.

Even Olympics badminton player Tse Ying Suet could not resist from commenting.

"Everyone is making an appointment to play badminton. Is everyone really into badminton?" she asked on Threads with a smirky face emoji.