Please correct me if I'm wrong, but isn't clamidia actual a urinary tract infection.

There are laboratory tests to diagnose chlamydia. Some can be performed on urine, other tests require that a specimen be collected from a site such as the penis or cervix.

Chlamydia can be transmitted during vaginal, anal, or oral sex. Chlamydia can also be passed from an infected mother to her baby during vaginal childbirth.
Any sexually active person can be infected with chlamydia. The greater the number of sex partners, the greater the risk of infection. Because the cervix (opening to the uterus) of teenage girls and young women is not fully matured, they are at particularly high risk for infection if sexually active. Since chlamydia can be transmitted by oral or anal sex, men who have sex with men are also at risk for chlamydial infection.

Chlamydia is known as a "silent" disease because about three quarters of infected women and about half of infected men have no symptoms. If symptoms do occur, they usually appear within 1 to 3 weeks after exposure.
In women, the bacteria initially infect the cervix and the urethra (urine canal). Women who have symptoms might have an abnormal vaginal discharge or a burning sensation when urinating. When the infection spreads from the cervix to the fallopian tubes (tubes that carry eggs from the ovaries to the uterus), some women still have no signs or symptoms; others have lower abdominal pain, low back pain, nausea, fever, pain during intercourse, or bleeding between menstrual periods. Chlamydial infection of the cervix can spread to the rectum.
Men with signs or symptoms might have a discharge from their penis or a burning sensation when urinating. Men might also have burning and itching around the opening of the penis. Pain and swelling in the testicles are uncommon.
Men or women who have receptive anal intercourse may acquire chlamydial infection in the rectum, which can cause rectal pain, discharge, or bleeding. Chlamydia can also be found in the throats of women and men having oral sex with an infected partner.

My sister caught HPV (cervical cancer, an STD) before she lost her virginity from giving a blow job and swallowing.

26 July 2007 by Roxanne Khamsi
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The tonsils might serve as a passageway through which HIV enters the body, suggests an analysis of cells from the mouth and throat.

Researchers stress that the risk of acquiring HIV through oral sex is far too low to warrant preventive tonsillectomies. But they say the finding might have implications for preventing transmission of the virus from HIV-infected mothers to their children through breastfeeding.

Niki Moutsopoulos at the National Institute of Dental and Craniofacial Research in Bethesda, Maryland, US, and her colleagues examined gum tissues taken from dental patients to make room for dental crowns, and tonsils taken from eight individuals as part of a treatment for sleep apnoea, a breathing disorder. "They were pretty much going to throw them out if I didn't use them for my research," Moutsopoulos says of the tissue samples.

With the help of specially designed antibody molecules, the team was able to determine the level of various proteins within these tissues.

About 12% of the tonsil cells tested positive for the protein CD4, which sits on the surface of immune cells that are particularly vulnerable to infection by the virus. By comparison, less than 4% of the gum cells contained this protein.

Moutsopolous and her teammates also conducted a genetic analysis of the tissue samples, using special probes that bind to specific DNA sequences. This experiment revealed that the CXCR4 gene was 11 times more active in the tonsils than in the gum samples. The gene codes for a protein, also called CXCR4, that also helps HIV infect immune cells.

Condoms protect
The scientists found further evidence that the tonsils are perhaps more susceptible to HIV infection that other oral areas, including the cheek lining and floor of the mouth.

The new findings provide biological data to complement clinical and epidemiological evidence suggesting that HIV can - in exceptional cases - spread through oral sex, according to John Greenspan, director of the AIDS Research Institute at the University of California in San Francisco, US. "It's a further piece of the jigsaw puzzle," he told New Scientist.

But he and others note that while HIV transmission can occur through oral sex, it appears to happen very rarely. Experts have estimated that at most 4 out of every 10,000 oral sex exposures result in infection, compared with 1 out of every 200 to 1000 episodes of genital contact.

For this reason, researchers suggest people should use condoms to protect themselves from acquiring HIV and other sexually transmitted diseases through oral sex. Undergoing a tonsillectomy to remove the tonsils would be too drastic a measure based on current evidence, they add. "I think that would be a stretch," says Moutsopoulos. "We can't go taking out every tissue that HIV could pass through."