Objective: To compile a global typography of commercial sex work. Methods: A Medline search and review of 681 ''prostitution'' articles was conducted. In addition, the investigators pooled their 20 years of collected papers and monographs, and their observations in more than 15 countries. Arbitrary categories were developed to compile a workable typology of sex work. Results: At least 25 types of sex work were identified according to worksite, principal mode of soliciting clients, or sexual practices. These types of work are often grouped under the headings of ''direct'' and ''indirect'' prostitution, with the latter group less likely to be perceived or to perceive themselves as sex workers. In general, policing sex work can change its typology and location but its prevalence is rarely affected. The public health implications of sex work vary widely. Conclusion: Developing comprehensive sexual health promotion programmes requires a complete understanding of the types of sex work in a particular area. This study provides a checklist for developing appropriate and targeted programmes.

Consideration should be given to developing a network of safe houses to reduce community pressure and violence.

We reviewed publications, websites, and field observations to explore the health and welfare impacts and administrative effectiveness of different legal approaches to sex work. We identified three broad legal approaches: (1) prohibition, including the unique Swedish law criminalising sex workers' clients; (2) licensing; and (3) decriminalisation. Each of these models is employed under one or more jurisdictions in Australia. We make preliminary observations on their consequences and conclude that, on initial impression, decriminalisation may offer the best outcomes. However, more rigorous population-based research is needed to properly assess the health and welfare impacts of legal approaches to sex work.