Sexually transmitted diseases-also known as STDs or venereal diseases-are infections passed from person to person through sexual intercourse, genital contact, or contact with semen, vaginal fluids, or blood.

Many of these diseases can also be spread by sharing needles and other items that may be contaminated with infected blood or body fluids.

STDs can affect anyone, no matter what his or her age. Talk openly with your partner about STDs and take whatever precautions are necessary to protect yourself before you engage in any form of sexual contact. If you think you may have an STD, see your health professional.

For more information, see the topics Safe Sex or Exposure to Sexually Transmitted Diseases.