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Anal sex is the highest-risk sexual behavior for hiv transmission. Vaginal sex has a lower risk, and activities like oral sex, touching, and kissing carry little to no risk for getting or transmitting hiv. The vast majority of men who get hiv get it through anal sex. Anal sex, hiv and sti having anal sex increases your risk of hiv and other sexually transmitted infections (stis) including chlamydia , genital herpes , genital warts , gonorrhoea and syphilis. However, there are simple steps you can take to protect yourself and your partner. The reason for this is that semen containing hiv can come into contact with anal mucosal tissues, which can absorb hiv during sex. And the risk of transmission isnt necessarily reduced if the insertive partner, or top, pulls out before ejaculation. Studies show that pre-ejaculate (pre-cum) can contain high amounts of hiv and can result in. Hiv is spread primarily by unprotected sex (including anal and oral sex), contaminated blood transfusions, hypodermic needles, and from mother to child during pregnancy, delivery, or breastfeeding. Some bodily fluids, such as saliva, sweat and tears, do not transmit the virus. Hiv is a member of the group of viruses known as retroviruses. Damage to analvaginal tissues, especially if there is any bleeding, will increase risk of hiv transmission if you then have anal, vaginal or oral sex later. If youre hiv-negative and have an hiv-positive partner who is taking art, your partner is much less likely to transmit hiv to you if they have a very low or undetectable viral load. You can also take pre-exposure prophylasis daily to lower your chance of getting hiv even more. Hiv transmission through these exposure routes is technically possible but unlikely and not well documented. Estimating per-act hiv transmission risk a systematic review. Hiv treatment significantly reduces the risk of someone with hiv passing it on. Most people diagnosed with hiv in the uk acquire the virus through unprotected vaginal or anal sex. It may also be possible to catch hiv through unprotected oral sex, but the risk is much lower. It is roughly spherical with a diameter of about 120 nm, around 60 times smaller than a red blood cell. It is composed of two copies of positive-sense single-stranded rna that codes for the viruss nine genes enclosed by a conical capsid composed of 2,000 copies of the viral protein p24. We know that for hiv transmission to be possible, a fluid that contains hiv must come into contact with specific parts of the body that are vulnerable to hiv infection. If an hiv-negative person has insertive anal sex with an hiv-positive partner, rectal fluid containing hiv can come into contact with the urethra andor the penis foreskin.