"Rugby World Cup-related sex" was mostly drunken and risky, new research shows.
The joint study by University of Otago epidemiologists and public sexual health clinics in Auckland, Hamilton, Wellington and Dunedin found looked at diagnoses during the time of the Cup.
Lead author Rebecca Psutka, a research fellow in epidemiology at the University of Otago, said people who went to the clinics around that time were surveyed and about 7 per cent, or 151 people, had Rugby World Cup-related sex.
More men than women visited the clinics after such sex.
Compared to other men, those who had RWC-related sex had twice the risk of chlamydia, three times the risk of non-specific urethritis and five times the risk of gonorrhoea.