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A study anal insertive intercourse hiv transmission rate lesbians also observed no transmissions due to oral sex [ 66 ]. For example, research shows that STIs and some vaginal conditions, such as bacterial vaginosis, can increase the risk of HIV transmission by up to 8 times. Needle-sharing injection drug use We identified three studies [ 10 — 12 ] that anal insertive intercourse hiv transmission rate estimates of the per-act risk of HIV transmission from injection drug use with a contaminated needle. Flannery et al. When it comes to calculating risk of HIV transmission, some people can really get fixated on specific percentages. Researchers ask HIV-negative individuals enrolled in these studies to report how many times they have had sex in a given period of time, what type of sex they had, how often they used condoms and the HIV status of their partner s.