As a preliminary matter, I note that the YAC’s proposed framework presumes that the risk of transmission can be quantified and calculated. However, as he acknowledged, the epidemiological studies available only provide rough estimates of the risk of transmission, and what is known about HIV is continuously evolving. Dr Ng was of the opinion that it is not currently possible to predict to an acceptable level of certainty an individual’s risk of HIV acquisition based on his risk factor profile. In any event, the involved parties may not be able to recall events with sufficient detail to make a quantitative calculation of the risk of transmission meaningful. For example, in the present case, it is unknown exactly how many times the appellant had engaged in sexual activity with the victim, or the appellant’s viral load at the material time, even though these would be key factors in computing the risk of transmission. As such, it would not be helpful to devise a framework which requires the risk of transmission to be calculated with such precision. Rather, the sentencing court should qualitatively assess the risk of transmission with regard to the risk factors for HIV transmission.