Studies show over 80% of all sexually active adults will contract an STD at some point, although most won't notice. That's because 80% of all people who contract one of the 25 varieties of STDs don't show any symptoms and most don't even realize they have one. In fact, the American Social Health Association estimates that 80% of sexually active people contract the Human Papillomavirus (HPV) at one point in their life. While those statistics were taken before the HPV vaccine was released, the vaccine only prevents two of the most dangerous strains of the disease, meaning even those vaccinated can still catch one of the many other strains.
While the numbers sound scary, the upside is that most people who contract an STD won't suffer any negative effects as a result.
That's just one of a list of ten thing you probably didn't know that you can learn about at Oddee. Be prepared that this list contains adults-only subject matter, but the images are SFW. Link