HomeHealth and familySexual health Sexually transmitted infections Learn about the different types of infections and getting tested. Sexually transmitted infections (STIs) are infections that are spread through any type of sexual contact including oral, anal, and vaginal sex.Many sexually transmitted infections don’t have any obvious symptoms, but can lead to serious health problems if left untreated.Learn more about:STIs, including HIVGetting tested for STIs, including pap tests and what to expectHIV and hepatitis C Related information Healthy sexuality clinic appointments Your sexual health