The Centers for Disease Control and Prevention estimates that there are about 19 million new cases of sexually transmitted diseases in the United States each year, racking up about $15.9 billion annually in medical costs. But while they can pose serious health risks, many STDs do not have any symptoms, so it is important to get tested regularly. Find HIV and STD testing sites by typing in your ZIP code at www.findSTDtest.org. Protect yourself and your partner by being open and honest about your histories, and talk to your doctor about vaccination opportunities (for human papillomavirus or hepatitis B, for example, if you haven’t been vaccinated already).