En Español Yes, it is possible for either partner to become infected with HIV through
vaginal sex* (intercourse). In fact, it is the most common way the virus
is transmitted in much of the world. HIV can be found in the blood,
semen (cum), pre-seminal fluid (pre-cum) or vaginal fluid of a person
infected with the virus.
In women, the lining of the vagina can sometimes tear and possibly allow
HIV to enter the body. HIV can also be directly absorbed through the
mucous membranes that line the vagina and cervix.
In men, HIV can enter the body through the urethra (the opening at the
tip of the penis) or through small cuts or open sores on the penis.
Risk for HIV infection increases if you or a partner has a sexually
transmitted disease (STD). See also "Is
there a connection between HIV and other sexually transmitted diseases?"
Not having (abstaining from) sex is the most effective way to avoid HIV.
If you choose to have vaginal sex, use a latex condom to help protect both
you and your partner from HIV and other STDs. Studies have shown that latex
condoms are very effective, though not perfect, in preventing HIV
transmission when used correctly and consistently. If either partner is
allergic to latex, plastic (polyurethane) condoms for either the male or
female can be used.
For more information on latex condoms, see "Male
Latex Condoms and Sexually Transmitted Diseases."
If you have additional questions or are concerned about personal
behaviors, call CDC-INFO 24 Hours/Day at
1-800-CDC-INFO (232-4636), 1-888-232-6348 (TTY), in English, en Español.
* For the purpose of this FAQ, vaginal sex or intercourse refers to
sexual activity between a man and a woman involving the insertion of the
penis into the vagina.
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