The Federal Health Office and the Swiss Aids Federation have launched this year's national Aids campaign with some eye-catching – and unusual – advertisements.
The "Love Life Stop Aids" posters feature couples having sex in exotic locations, including in a cave and in the jungle, as well as on Mars, dressed as astronauts.
The Health Office says that a study conducted last year showed that people who normally protect themselves adequately sometimes choose not to use condoms in certain situations.
The St Gallen University Hospital study found that 12 per cent of people who had recently contracted HIV had done so on a business trip or on a foreign holiday.
The campaign is encouraging people to think ahead and not go to a party or on holiday without condoms.
According to the Health Office, the sections of the population more likely to be infected include injection drug users, people from sub-Saharan Africa and gay men.
Around 25,000 people live with HIV/Aids in Switzerland.
The "Love Life Stop Aids" campaign's interactive website provides answers and advice for a range of sex-related questions.
In compliance with the JTI standards