what's an std
What is an STD? A Sexually Transmitted Disease (STD), often referred to as a Sexually Transmitted Infection (STI), is any disease or infection that may be transmitted by human sexual behavior. This includes intercourse, oral sex and anal sex. Transmission of some STDâs can also occur from using an IV needle that has already been used by an infected person as well or by receiving a blood transfusion of infected blood. A mother can pass on some infections to her baby through pregnancy and while breastfeeding.