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Key Takeaways
- Pre-seminal fluid, or pre-cum, can contain HIV and cause an infection.
- Pulling out before ejaculation does not fully prevent the risk of HIV transmission.
- To reduce HIV risk, use PrEP if you don’t have HIV, or take antiretroviral therapy if you do.
Having sex without ejaculation might lower the risk of HIV transmission, but it doesn’t eliminate it. This is because HIV in precum, or pre-seminal fluid, can still pose a risk.
Illustration by Julie Bang for Verywell Health
HIV Risks With Pre-Seminal Fluid
HIV transmission can occur through direct contact with specific body fluids from someone with HIV, such as:
- Blood
- Semen
- Vaginal fluids
- Breast milk
- Anal secretions
Pulling out before ejaculation may lower the risk, but it doesn’t prevent HIV transmission entirely. This is because pre-seminal fluid can also contain the virus.
For individuals with HIV, pre-seminal fluid can have virus amounts similar to those in semen, meaning that withdrawal before ejaculation does not fully protect the receptive partner from exposure to HIV.
Pre-seminal fluid (“pre-cum”) contains roughly the same high concentration of HIV as semen. During unprotected (also referred to as “condomless”) sex, pre-seminal fluid can potentially cause an infection.
Can You Get HIV From One Exposure?
HIV infection can occur after just one exposure, though the risk varies based on the type of exposure or behavior.
| Risk of Acquiring HIV From an Infected Source | |
|---|---|
| Type of Sexual Exposure | Risk Per 10,000 Exposures |
| Receptive anal sex | 138 |
| Insertive anal sex | 11 |
| Receptive penile-vaginal sex | 8 |
| Insertive penile-vaginal sex | 4 |
| Receptive oral sex | Low |
| Insertive oral sex | Low |
Factors That Can Increase Your HIV Risk
While some people believe pre-seminal fluid poses a lower HIV risk because it is less in volume than semen, several factors can increase this risk.
Pre-seminal Fluid Volume
Men typically produce between a few drops to more than 5 mL of pre-cum. An older study found that some men may produce larger amounts, especially after extended abstinence.
HIV Viral Load
An untreated HIV infection can lead to a high viral load. The HIV viral load is a measure of the number of viruses in a sample of blood, ranging from undetectable to well over a million. A higher viral load in the blood corresponds to a higher concentration of viruses in pre-cum.
Anal Sex
The risk of HIV from anal sex is high because rectal tissues are delicate and easily broken. This allows the virus to pass directly into the bloodstream.
At the same time, the rectum has only a single layer of cells overlying tissues that are rich in immune cells called CD4 T cells. These are the very cells that HIV targets and infects. Because of this, even a small volume of fluid may establish an infection.
Sexually Transmitted Infections (STIs)
Syphilis, gonorrhea, and herpes can increase your risk of getting HIV in the future. Some STDs, like syphilis, cause ulcers that provide HIV easy access into the body. Others, like gonorrhea, cause inflammation that draws immune cells, including CD4 T-cells, to the site of infection, giving HIV more targets to infect. These factors can raise the risk of infection.
HIV Shedding
An STI or similar infection can also increase the number of viruses in semen through a process known as viral shedding. The inflammation caused by the infection can speed up the production of the HIV virus in the tissues of the genitals. The viruses are then “shed” into semen and pre-seminal fluid, increasing their infectiousness.
Someone with an undetectable viral load in their blood can still have detectable HIV in their semen and pre-seminal fluid due to shedding.
Even though the concentration of HIV in the pre-seminal fluid is lower than in semen, certain factors can increase the risk of HIV, including having a high viral load, having an STI, or engaging in anal sex.
Weighing the Risk of Pulling Out During Sex
In the end, there is no hard and fast rule as to how much or how little pre-seminal fluid is needed to cause an HIV infection. There are many variables that play a role in determining a person’s risk.
While pulling out before ejaculation may reduce the chances of transmission, it does not eliminate it. For example, an older study showed that condomless receptive anal sex with ejaculation was found to be approximately twice as risky as condomless receptive unprotected anal intercourse with withdrawal. While the risk of contracting HIV is lower with withdrawal, there is definitely a risk.
If you don’t use external or internal condoms consistently, there are ways to reduce the risk of getting HIV or passing it to others:
The current evidence suggests that pre-seminal fluid can transmit HIV. To reduce the risk of infection, you can take the HIV prevention pill (PrEP) if you don’t have HIV, or start antiretroviral therapy and maintain an undetectable viral load if you do.