Sexually-transmitted infections, or STIs, range from basic bacterial infections like chlamydia to incurable viruses like HIV. While many people avoid talking about these diseases because they are embarrassed or think it can't happen to them, sexual health is everyone's responsibility. Take our quiz to see how much you know about different STIs, how they spread, and how you can protect yourself.
How much do you know about how car engines work? And how much do you know about how the English language works? And what about how guns work? How much do you know? Lucky for you, HowStuffWorks is about more than providing great answers about how the world works. We are also here to bring joy to your day with fun quizzes, compelling photography and fascinating listicles. Some of our content is about how stuff works. Some is about how much you know about how stuff works. And some is just for fun! Because, well, did you know that having fun is an important part of how your brain works? Well, it is! So keep reading!