Before you begin having sex with someone new, it's important for each of you to see a doctor or testing clinic for STD screening. This protects you both and, if necessary, allows you to seek treatment for an STD. In addition to this routine screening, you should see your doctor immediately if you experience abnormal discharge from your penis or vagina, pain during sex, pain during urination, or growths on your genitals or anus, such as bumps, blisters, sores or a rash. However, some STDs have minimal or no symptoms, and this makes routine testing absolutely vital for sexually active people. Most STDs can be diagnosed via blood, urine, or cell samples. But here's where things get tricky: most doctors won't test you for STDs if you don't ask, and not every doctor will test for every disease. That is why you need to initiate the STD talk with your doctor. Ask what she usually screens for in an STD test and see if you're being checked for everything that you're worried about. Most insurance plans will cover STD testing, but it is also possible to obtain inexpensive or free tests from government-funded and independent testing clinics. Your local Planned Parenthood is a great place to start.