SEX may be risky wherever you are. But those indulging in the riskiest behaviour often live in some of the world's richest nations, according to Foreign Policy magazine, using data from the latest Durex Global Sex Survey—the world's largest survey of sexual behaviour, with over 317,000 participants in 41 countries. They have sex at a younger age and sleep with more people, both indicators for contracting sexually transmitted infections. Each year, there are more than 340m new cases of such infections globally, excluding HIV.

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