Hepatitis C can be sexually transmitted, but it’s not the most common way the virus spreads. HCV is primarily a bloodborne virus, meaning it passes from person to person through direct blood contact. Sexual transmission happens when sex involves exposure to even small amounts of infected blood, which is why certain sexual practices carry significantly more risk than others.
Why Blood Contact Is the Key Factor
Unlike viruses such as HIV or herpes, hepatitis C doesn’t spread efficiently through semen or vaginal fluids on their own. The virus has been detected in the semen and rectal fluids of men living with HIV, but blood remains the primary vehicle for transmission. This is why most hepatitis C infections worldwide trace back to shared needles, unscreened blood transfusions, or unsafe medical procedures rather than sexual contact.
During sex, the risk increases whenever there’s a chance of blood exposure. That includes sex during menstruation, anal sex (which can cause small tears in the rectal lining), rough sex that breaks the skin, or sex when either partner has open sores or cuts on their genitals. Even microscopic amounts of blood that you can’t see can carry enough virus to cause infection.
Risk for Monogamous Heterosexual Couples
If you’re in a long-term, monogamous relationship with a partner who has hepatitis C, your risk of catching it through sex is low. Mayo Clinic describes the risk for people with a single infected partner as low, and many couples in this situation never transmit the virus between them over years or even decades. Vaginal intercourse without blood exposure is an inefficient route for HCV.
That said, “low risk” isn’t “no risk.” Using condoms reduces the chance further, and some couples in long-term relationships choose to use them while others don’t, depending on their comfort level and individual circumstances. Factors that tip the balance include whether either partner has HIV, whether sex involves menstrual blood, and whether there are genital sores from other infections.
Why Risk Is Higher for Men Who Have Sex With Men
Sexual transmission of hepatitis C is a much bigger concern among men who have sex with men (MSM), particularly those living with HIV. Research has documented an HCV incidence rate of about 6.35 per 1,000 person-years among HIV-positive MSM, a rate high enough that routine screening is recommended for this group.
A CDC study in New York City identified specific practices that dramatically increased risk. Unprotected receptive anal sex with ejaculation raised the odds of acquiring HCV by roughly 23 times compared to controls. Group sex increased odds by about 19 times. Using drugs like methamphetamine during sex raised the odds nearly 29-fold, likely because these substances lower inhibitions, extend the duration of sex, and increase the likelihood of tissue trauma and bleeding. Fisting, both receptive and insertive, and sharing sex toys also carried significantly elevated risk.
Reinfection after successful treatment is another concern in this population. Among HIV-positive MSM who were cured of hepatitis C, reinfection rates ranged from 7.3 to 15.2 per 100 person-years. Even more striking, the risk of reinfection climbed with each subsequent episode: after a second cure, the incidence of yet another reinfection jumped to nearly 19 per 100 person-years. This pattern suggests that ongoing sexual risk behaviors, rather than incomplete immunity, drive repeated infections.
How HIV Changes the Equation
HIV co-infection is one of the strongest risk factors for sexual transmission of hepatitis C. There are a few reasons for this. People with HIV who also carry HCV tend to have higher levels of the virus in their blood, semen, and rectal fluids. HIV also damages the immune defenses in the lining of the gut and genital tract, making those tissues more vulnerable to infection. And the two viruses share overlapping risk factors, so populations affected by one are often exposed to the other.
The CDC has documented that HCV can be recovered from the semen of men with HIV, and that continued unprotected sexual contact between HIV-positive partners facilitates HCV spread. For anyone living with HIV, getting tested for hepatitis C is a standard recommendation.
Reducing Your Risk During Sex
The U.S. Department of Veterans Affairs recommends using latex condoms correctly and every time if any of the following apply: you have rough sex that might cause bleeding, you have sex during menstruation, or either partner has open sores or cuts on their genitals. Condoms create a barrier that prevents blood-to-blood contact, which is the core transmission route.
Beyond condoms, practical steps include avoiding sharing sex toys (or covering them with a new condom between partners), being cautious with practices that can cause tissue tears, and getting tested regularly if you have multiple partners or fall into a higher-risk group. If you or a partner has hepatitis C, treating and curing the infection eliminates the risk of passing it on. Modern antiviral treatments cure more than 95% of cases, typically within 8 to 12 weeks.
Who Should Get Tested
The CDC recommends that every adult aged 18 and older get tested for hepatitis C at least once in their lifetime. Pregnant women should be tested during each pregnancy. Beyond that baseline, people with ongoing risk factors, such as those who inject drugs or receive hemodialysis, should get tested periodically.
People living with HIV are specifically called out for one-time testing. And the CDC makes an important point: anyone who requests a hepatitis C test should receive one, regardless of whether they disclose a specific risk factor. Many people are hesitant to share behaviors that carry stigma, and a simple blood test can catch an infection that’s completely curable when found.