However, STDs are most common among teens and young adults, with about two-thirds of all STDs occurring in people under age 25. This is because young people are more likely to be more sexually active and take more risks, and the cervix of a teenager is more likely to get infected by Chlamydia and gonorrhea. STDs are spread through contact with infected body fluids, such as blood, vaginal fluids, or semen. They can also be spread through contact with infected skin or mucous membranes, like sores in the mouth. You may be exposed to infected body fluids and skin through vaginal, anal or oral sex if you don't correctly use a latex condom.
Anal sex is very risky because it usually causes bleeding.
Sharing needles or syringes for drug use, ear piercing, tattooing, etc. Most STDs are only spread through direct sexual contact with an infected person. Many STDs may not cause any symptoms. If you do have get symptoms caused by a STD, you may think you have another disease, since STD symptoms are similar to those caused by other diseases. If you have any of these symptoms, you could have a STD, but they might also not mean anything serious.