What are STDs and how can their spread be prevented?

Sexually transmitted diseases (STDs) are infections that are transmitted during any type of sexual exposure, including intercourse (vaginal or anal), oral sex, and the sharing of sexual devices, such as vibrators. In the professional medical arena, STDs are referred to as STIs (sexually transmitted infections). This terminology is used because many infections are frequently temporary. Some STDs are infections that are transmitted by persistent and close skin-to-skin contact, including during sexual intimacy. Although treatment exists for many STDs, others currently are usually incurable, such as HIV, HPV, hepatitis B and C, and HHV-8. What is more, many infections can be present in, and be spread by, patients who do not have symptoms.

The most effective way to prevent the spread of STDs is abstinence. Alternatively, the diligent use of latex barriers, such as condoms, during vaginal or anal intercourse and oral-genital contact helps decrease the spread of many of these infections. Still, there is no guarantee that transmission will not occur. In fact, preventing the spread of STDs also depends upon appropriate counseling of at-risk individuals and the early diagnosis and treatment of those infected.

In this article, the STDs in men have been organized into three major categories: (1) STDs that are associated with genital lesions; (2) STDs that are associated with urethritis (inflammation of the urethra, the canal through which urine flows out); and (3) systemic STDs (involving various organ systems of the body). Note, however, that some of the diseases that are listed as being associated with genital lesions (for example, syphilis) or with urethritis (for example, gonorrhea) can also have systemic involvement.

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