Is Oral Sex Really Safe Sex?

Oral Sex and STDs

(c) 2014 Elizabeth R. Boskey licensed to, Inc.

Many people question whether oral sex is really sex. That depends on how you define sex, but one thing is clear. Oral sex isn't inherently safe sex. It can transmit a number of different STDs, at least if you don't take proper precautions. I've provided an overview of some common oral sex STDs, and the risk of STD transmission during oral sex, below.


Although oral sex is a relatively low-risk activity, particularly when compared to vaginal or anal sex, it is possible to transmit HIV through oral sex.

Using latex or polyurethane condoms, female condoms, or dental dams is an effective way to reduce your chances of contracting the virus when engaging in oral sex. If you don't choose to use protection for oral sex, you should know that the risk of HIV transmission increases if the person performing the act has cuts or sores in his/her mouth, if ejaculation takes place in the mouth, and if the individual receiving oral sex has any other sexually transmitted diseases. The risk is primarily for the person performing the oral sex. Unless a partner has significant amounts of blood in his/her mouth, such as from dental surgery, oral sex is unlikely to expose the receptive partner to HIV.


Although genital herpes and oral herpes are usually caused by different strains of the herpes virus, HSV-2 and HSV-1 respectively, it is possible for either virus to infect either site. Therefore, it is possible to transmit herpes during oral sex, and the virus can spread from either partner.

Herpes is contagious even when symptoms are not present. Even though prophylactic medications, such as Zovirax (acyclovir), can reduce the likelihood of both outbreaks and transmitting the herpes virus to your partner, they can not eliminate the risk entirely. Although they should greatly reduce the risk of herpes transmission, condoms are also not completely effective in preventing transmission of herpes during oral sex, since the virus can spread from skin to skin.


It is possible to spread HPV through oral sex, and it is believed that HPV acquired while performing oral sex is a major risk factor for oral and throat cancers. HPV can also appear in the oral cavity through vertical transmission (transmission from mother to child during birth). As with herpes, it seems likely that the use of condoms or dental dams during oral sex should reduce the risk of infection, but they will not necessarily eliminate it entirely since HPV spreads via skin-to-skin contact, not through bodily fluids.


In recent years, teenagers with throat infections caused by gonorrhea have often been in the news. Gonorrhea can be transmitted in both directions when oral sex is performed on a man, and throat infections with gonorrhea are notoriously difficult to treat. There is limited research to suggest that it may be possible for someone to acquire a gonorrhea throat infection while performing oral sex on a woman, but transmission in the other direction is relatively unlikely since the site of infection is the cervix -- a part of the female anatomy not reached during cunnilingus. Condoms and dental dams should be extremely effective in preventing transmission of gonorrhea during oral sex.


It is possible to transmit chlamydia during fellatio, and both the recipient and the person performing the act are at risk. There has been little research on whether it is possible to transmit chlamydia during cunnilingus, but infection risk is probably similar to that for gonorrhea.


Syphilis is extremely easy to transmit via oral sex. In fact, in some areas of the United States, oral sex has been shown to be responsible for as many as 15% of syphilis cases. Although syphilis can only be transmitted in the presence of symptoms, during the primary and secondary stages of the disease, the painless sores it causes are easy to miss.

Hepatitis B

The research is inconclusive as to whether or not hepatitis B can be transmitted via oral sex. Oral-anal contact, however, is definitely a risk factor for hepatitis A infection, and it may also be a risk factor for hepatitis B. Fortunately both hepatitis A and B can be prevented by vaccines. If you practice rimming, you should talk with your doctor about getting vaccinated. Vaccination is a good idea in any case, and the hepatitis B vaccine is currently recommended for all children and many groups of adults.

Making Oral Sex Less Risky

It is possible to reduce the risk of getting an oral sex STD by using barriers during oral sex. That means using dental dams (either purchased or made from condoms or gloves) during cunnilingus and rimming and condoms during fellatio. Doing so won't eliminate the risk of diseases such as syphilis and herpes, which are spread skin-to-skin, but it will greatly reduce it.

The Bottom Line

In summary, unprotected oral sex puts you at risk for numerous sexually transmitted diseases. If you perform unprotected oral sex on your sexual partners, you should mention it to your physician. She may want to check your throat when she is screening you for other STDs.


"Can I get HIV from oral sex? from the CDC. Accessed 2/15/07.

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Kent C.K. et al. "Prevalence of Rectal, Urethral, and Pharyngeal Chlamydia and Gonorrhea Detected in 2 Clinical Settings among Men Who Have Sex with Men: San Francisco, California, 2003" Clin. Infect. Dis. 2005; 41:67–74.

Kreimer A.R. et al. "Oral Human Papillomavirus Infection in Adults Is Associated with Sexual Behavior and HIV Serostatus" J. Infect. Dis. 2004;189:686–98.

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Petermana T.A. and Furnessa, B.W. "The resurgence of syphilis among men who have sex with men" Curr Opin Infect Dis 20:54–59.

"Transmission of Primary and Secondary Syphilis by Oral Sex --- Chicago, Illinois, 1998-2002" MMWR 53(41):966-968 Accessed 2/17/07.

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