A street prostitute in Dallas may make as little as $5 per sex act. But pimps can take in $33,000 a week in Atlanta, where the sex business brings in an estimated $290 million per year. It is not nearly as lucrative in Denver, where prostitution and other elements of an underground trade are worth about $40 million.

Those are some of the findings of a landmark government-sponsored report on the size and structure of the sex economy, including massage parlors, brothels and expensive escort services. The study also found that four in five pimps elect not to deal drugs and that little money trades hands in the child pornography business.

The study did find pricing was consistent across the country, with $150 an hour the common going rate for prostitution. The age, race and drug use of a sex worker affected the price. Pimps told the interviewers that they could charge more for white women and younger women. But, one said, “Honestly, you just have to stay away from minors.”