Love is in the air, my friends. And you know what else is in the air? A whole world of bacterial and viral infections just waiting to make themselves at home in your vulnerable mucus membranes. Sexually transmitted infections (STIs) aren't gross, yucky, a sign of poor judgement or character, or even all that uncommon. In fact, if you have sex, you're probably going to end up getting one. You're literally more likely to get one than to never get one. You might even have one right now and not know it. And that's not the end of the world.