All sexually active people, particularly those who have had multiple sex partners — gay or straight— should get tested.

Even people in monogamous relationships should be tested and should know their partner’s status.What is an HIV test?When HIV enters the bloodstream, it begins to attack certain white blood cells known as CD4 cells. The immune system then produces antibodies to fight off infection. When you take an HIV test, doctors are actually looking for the presence of these antibodies, which confirm that HIV infection has occurred