This section provides the facts about HIV risk from different types of sex, injection drug use, and other activities. You can get or transmit HIV only through specific activities. Most commonly, people get or transmit HIV through sexual behaviors and needle or syringe use. Only certain body fluids—blood, semen cum , pre-seminal fluid pre-cum , rectal fluids, vaginal fluids, and breast milk—from a person who has HIV can transmit HIV. These fluids must come in contact with a mucous membrane or damaged tissue or be directly injected into the bloodstream from a needle or syringe for transmission to occur.