Nutshell on Instagram: "STIs can happen to anyone who’s sexually active. It doesn’t matter if it’s your first time or your hundredth. They can spread through vaginal, oral, or anal sex—and some, like herpes and HPV, can pass through simple skin-to-skin contact. There are over 20 types of STIs including chlamydia, gonorrhea, syphilis, herpes, HIV, HPV, trichomoniasis, and more. A lot of them don’t show symptoms right away (or ever), which means you could have one and not even know it. Protection