Chlamydia and gonorrhea are both bacterial infections and are quite common (in fact, chlamydia is the most common infection in the United States). Together they comprise the majority of STDs worldwide. They can be transmitted predominantly by vaginal and anal intercourse, but can also be transmitted by oral sex.
While bacteria can cause infection on many places in the body, chlamydia can infect the urethra, anal region, epididymis (in men) and cervix (in women). Gonorrhea can infect the throat, urethra, anal and rectal area, as well as the cervix (in women).
These infections are transmitted quite efficiently from male to female. However, research shows that condoms can reduce the risk of chlamydia and gonorrhea transmission. Risk factors that increase risk of transmission of chlamydia and gonorrhea include multiple sexual partners, younger age, inconsistent use of condoms and prior history of sexually transmitted infections.