Risk of Acquiring HIV Infection According to Sexual Practices

 

Parameters:

(1) sexual practice

(2) use of condom protection

Sexual Act	Relative Risk
insertive fellatio	1
receptive fellatio	2
insertive vaginal sex	10
receptive vaginal sex	20
insertive anal sex	13
receptive anal sex	100

 

The failure to use a condom increases the relative risk by 20 (relative risk with condom use is 1).

 

where:

• The risk estimates for vaginal and anal sex are from the European Study Group. This involved heterosexual couples in stable relationships. Homosexual and unstable couples might have higher rates.

• The presence of concurrent factors (other sexually transmitted disease, ulcerations, other immunosuppression) could increase the risk.

• A small breach in a latex condom might alter the risk estimate.

 

According to the CDC method of estimation:

 

cumulative risk for each sexual act =

= (relative risk for sexual act) * (relative risk for condom use)