I would like to draw your attention to the following information:
"Increasing condom usage is the single most effective public health measure to reduce a sexually-driven HIV epidemic. ...Increasing condom use apart, they should also be advised to avoid risky sexual practices, e.g., having multiple sex partners or having sex with unfamiliar people."
"Hong Kong can easily move from a low level to a concentrated HIV epidemic should the current situation continues. According to Dr.Brown's estimation, the consequence of failure to prevent this epidemic would mean 3000 more MSM needing HAART by 2020. This would be translated into, human morbidities and social costs aside, accumulative additional treatment cost exceeding one billion Hong Kong dollars by 2020."