Those are scary facts, especially if you are sexually active. While a few STIs are only unpleasant, most have dangerous consequences and require professional medical treatment. Some can cause sterility. Others can affect a developing fetus or newborn and may cause birth defects. Some increase the risk of getting certain cancers.
Nobody is immune to sexually transmitted infections.
But most people don't know that they have one, because they don't notice the symptoms - or they don't have any symptoms. Millions of people don't know they're infected until serious and often permanent damage has occurred - or until they pass the infection to someone else. You can prevent becoming infected with an STI by knowing how to protect yourself. If you are a woman , your risk of getting in STI is greater than a man's . Your vagina and rectum are more easily infected.