Some organisms are sometimes transmitted during sexual intercourse, although they are typically transmitted in other ways. These organisms include
These organisms, except for hepatitis B and C viruses, typically infect the digestive tract and are usually acquired when people consume contaminated food or water. In the digestive system, the organisms multiply and are excreted from the body in the feces. They can be spread through contact with the anus or feces of an infected person—for example, during anal sex.
Symptoms vary depending on the organism. They may include diarrhea, fever, abdominal pain or bloating, nausea, vomiting, and jaundice.
Infections recur frequently, especially in homosexual men with many sex partners. Some infections cause no symptoms but may have serious long-term complications, such as chronic hepatitis B or C (see Chronic Hepatitis).
Last full review/revision December 2014 by J. Allen McCutchan, MD, MSc