`For those who need an update on HIV/AIDS research this is a very welcome, informative text on the core issues in transmission and risk.... Bloor's ability to discuss the various theories of risk behaviour in relation to his research amongst Glasgow male prostitutes makes rewarding reading. Apart from the comprehensive view of HIV transmission the application of the phenomenological approach and specifically Schutz's systems of relevances as a "heuristic device for the ordering of a range of cognitive activity" is illuminating.... One further point is to do with the utility of the book.