Sex 18x

23 Jun

Two of these studies were conducted with gay men and two with heterosexuals, and the results did not vary by sexuality.

The estimate for receptive anal intercourse is almost identical to that in the recently published Australian study (1.43%, 95% CI, 0.48 to 2.85).

They estimate that the risk of transmission from a man with suppressed viral load may be reduced by as much as 99.9%.

Anal intercourse drives the HIV epidemic amongst gay and bisexual men.

To do this they used two different calculations for the relationship between viral load and transmission, derived from studies with heterosexuals in Uganda and Zambia.

For partners having both unprotected receptive and insertive intercourse, the summary estimate of transmission risk is 39.9% (95% CI, 22.5 to 57.4).

The authors comment that the data support the hypothesis that insertive intercourse is substantially less risky than receptive intercourse.

The individual studies that these estimates are based on often had very different results, in part due to different study designs and analytical methods.

This is despite the fact that the Australian data were collected after the widespread introduction of combination therapy.

The review did not identify any per-act estimates of the risk for the insertive partner.