Ask any social scientist and they'll agree: Humans are really, really, really good at having sex.

But, for as long as we've been having it, we've also been trying to prevent some of the less desirable things that sometimes come along with it — namely unwanted pregnancies and STIs.

Modern science and medical innovation give sexually-active people lots of safe and reliable options to do both, and condoms, in particular, are now extremely effective — preventing pregnancy and STIs about 98% of the time when they're used correctly.

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One thing the Rio Olympics will get right this year: condoms.

Brazil wants all Olympic visitors to have safe, eco-friendly sex.

Rio has had no shortage of problems leading up to the 2016 Olympics, but one problem it definitely won't have is a shortage of condoms.

The Brazilian government plans to distribute 9 million free condoms during the Rio Olympics.

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