Serosorting and How it Affects HIV Risk

Basics on Serosorting and Why It's Not a Good Practice

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Serosorting is a common practice among men who have sex with men, or MSM. Yet while it's perceived to lower the risk of getting HIV, it may actually increase a person's risk.

Let's gain a better understanding of serosorting, and why it's not a good practice to adopt.

What is Serosorting?

Serosorting is the practice of choosing sexual partners based on their HIV status. In other words, people "sort" their potential partners according to whether they are HIV positive or HIV negative.

Serosorting is increasing in popularity among men who have sex with men. According to a 2007 study in American Journal of Preventive Medicine, men who serosort are more likely to believe that because they serosort, their engagement in unprotected anal sex is less risky for getting HIV. They are also less likely to be concerned with using condoms when having anal sex. 

So because the fear of infecting a negative partner is removed, safer sex is often not used in people who serosort.

In fact, scientific data suggests that serosorting may actually increase the risk of HIV instead of decreasing it. This is especially true in areas where HIV testing is low, according to a 2010 study in Sexually Transmitted Diseases

How Can Serosorting Potentially Increase a Person's Risk of Getting HIV?

While an HIV positive and negative couple — a serodiscordant couple — would likely engage in safe sex practice to prevent infecting the HIV-negative partner, couples where both partners are thought to be negative are less likely to use protection.

In this case, the couple may not have considered the window of time between exposure and a positive HIV test. Remember, the body takes some time to produce enough antibodies for an HIV test to turn positive. Therefore, if a test is done before there is enough antibodies to be detected, the result will be negative even though there is an HIV infection.

Other variables that increase the risk of serosorting leading to an HIV infection include:

  • a partner being deceptive about their true HIV status — saying they are negative when they are not.
  • a person not knowing they are infected because they have not been tested recently for HIV.
  • a person assuming that their partner is HIV negative when in fact they are not.

Does Serosorting Protect Against Other Sexually Transmitted Infections?

No. According to the CDC, serosorting does not protect against other sexually transmitted infections. Examples of other sexually transmitted infections include:

What Can I Do?

Because serosorting is used in men who have sex with men (MSM), the CDC recommends that MSM undergo HIV and STD testing at lease once a year, and consider every 3 to 6 months.

In addition, abstinence or practicing safe sex with condoms will help prevent HIV transmission. Be smart about your sexual health and risks.


Centers for Disease Control and Prevention. (2011). Serosorting amon Gay, Bisexual, and Other Men Who Have Sex with Men. Retrieved October 5th 2015.

Eaton L et al. Serosorting Sexual Partners and Continued Risk for HIV Transmission among Men who have Sex with Men. Am J Prev Med. 2007 Dec;33(6):479-85.

Serosorting Sexual Partners and Continued Risk for HIV Transmission among Men who have Sex with Men

Wilson DP et al. Serosorting may increase the risk of HIV acquisition among men who have sex with men. Sex Transm Dis. 2010 Jan;37(1):13-7. 

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