The Hong Kong Aids Foundation said it recently surveyed 600 men who have a habit of visiting sex workers.
Some 70 percent said they were continuing to go to prostitutes during the pandemic, although two-thirds said they were cutting back on their visits.
Only six percent of the respondents said they kept their face masks on during sex, the foundation said.
Its chief executive, Eris Lau, recommended that people should get vaccinated, wear face masks, check their body temperature and use the LeaveHomeSafe app when visiting sex workers.
Lau added that it is disappointing that almost 80 percent of the respondents said they didn’t get HIV tests despite their visits to prostitutes.