Thanks, Kurosawa -- HIPS is a great local organization.  I've been on the host committee for an annual HIPS event, and the people involved are inspiring.  This particular need would not have occured to me, but it makes sense once you talk to folks. 
  Here's their 
website. 
 "HIPS mission is to assist female, male, and transgendered individuals engaging in sex work in Washington, DC in leading healthy lives. Utilizing a harm reduction model, HIPS' programs strive to  address the impact that HIV/AIDS, discrimination, poverty, violence and drug use have on the lives of individuals engaging in sex work."