http://www.alternet.org/story/16406/sex_workers_and_civil_rights says:
Meanwhile similar results -- rampant violence, harassment, substance abuse, health and housing problems -- were documented in a Chicago study released in 2001 by the Center for Impact Research. That study found 1,800 to 4,000 girls and women are involved in on- or off- street prostitution activities in Chicago in any given year, along with about 11,500 people who trade sex for drugs. These numbers -- comparable in other major cities -- show that the mistreatment of sex workers is a significant national civil and human rights situation that affects thousands and thousands of women (and men) and by extension their children or other family members.
The CIR study showed that 21.4 percent of women working as escorts had been raped 10 times or more, with comparable rates for other types of sex work. Meanwhile the rapes, beatings and other abuses male and female sex workers suffer are rarely prosecuted.
Is it true?