In 1991 an informal alliance of sex workers and organizations that provide services to sex workers formed as the Network of Sex Work Projects. NSWP is a legally constituted international organisation for promoting sex workers' health and human rights. With member organizations in more than 40 countries, the Network develops partnerships with technical support agencies to work on independently-financed projects.
NSWP membership is open to sex worker organisations and sex work projects who include both sex workers and allies who support the aims of the NSWP and agree with the membership criteria specified in the registration document, which states the principles and values that organisations must agree to in order to become members. These are:
* Acceptance of sex work as work
* Opposition of criminalisation of sex work
* Supporting self-organising and self-determination of sex workers