During a median follow-up period of 1. No HIV transmissions occurred. The investigators concluded that the risk of HIV transmission through vaginal intercourse in these circumstances was effectively zero Rodger. When HIV is not suppressed by antiretroviral treatment, vaginal intercourse without a condom is a highly efficient route of HIV transmission because high concentrations of HIV can occur in semen and vaginal fluids, and because the genital tissues are very susceptible to infection. This allows the virus to reach the inner vaginal lining, which is rich in immune cells through which it can establish systemic infection. Cells located beneath the surface of the cervix are particularly vulnerable to HIV infection, especially during adolescence and during a woman's first pregnancy, or due to infection with human papillomavirus and chlamydia.

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How Can You Prevent Getting or Transmitting HIV through Sex?
A person with HIV can pass the virus on to others even if they do not have any symptoms. People with HIV can pass the virus on more easily in the weeks following infection. HIV is not passed on easily from one person to another.
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Women are more likely to contract HIV during vaginal sex than men for several reasons. The vagina has a larger area compared to the penis , which is exposed to HIV-infected semen. Sperm can remain in the vagina for several days after intercourse, which means a longer exposure time virus in women, while men are exposed to HIV-infected fluids only during sex. Small irritation to the skin or mucous membranes of the genitals of women is hard to notice, but enough for the virus.
Most people who get HIV get it through anal or vaginal sex, or sharing needles, syringes, or other drug injection equipment for example, cookers. But there are powerful tools that can help prevent HIV transmission. HIV can be transmitted from a mother to her baby during pregnancy, birth, or breastfeeding. However, it is less common because of advances in HIV prevention and treatment. You are at high risk for getting HIV if you share needles, syringes, or other drug injection equipment for example, cookers with someone who has HIV. Never share needles or other equipment to inject drugs, hormones, steroids, or silicone. There is little to no risk of getting HIV from the activities below.