STIs are spread primarily through blood, semen, vaginal secretions, and the discharge from sores or lesions caused by STIs. The most likely way to get an STI is to have vaginal, oral, or anal sex without any protective barrier between the body parts involved. You can also get infected through contact with sores or lesions on other parts of the body, or through sharing razors, needles, or an object like a sex toy, if body fluids from another person are on it. Some STIs, like herpes, can pass from one person to another through skin-to-skin contact. Getting STIs from toilet seats or towels is not likely. Transfusions or transplants can infect someone if blood and organs are not carefully screened for disease, but screening is now strictly instituted in the United States.
Find out more about this book:Our Bodies, Ourselves: A New Edition for a New Era