Sexually Transmitted Infections and HIV/AIDS have been on the rise in the United Kingdom in recent years. Female commercial sex workers are at a higher risk for STIs due to their high number of sexual partners. It has been shown that regular screening along with appropriate treatment can reduce the transmission of certain STIs as well as seroconversion of HIV in sex workers. Therefore, it is essential that these services are available to these sex workers but often they do not utilise regular STI services and therefore outreach work helps to ensure the coverage of sexual health care to those that require it the most. This book evaluates such an outreach programme running in Sheffield, United Kingdom.