Prostitution ads, often with explicit sexual language, are back on Craigslist, according to a new report.

Craigslist, the online classified ad site, eliminated its adult services section in 2010 amid pressure from state attorneys general from across the country. But that hasn’t stopped prostitution ads from showing up in the “casual encounters” and “therapeutic massage” sections of the site in some markets, according to the Classified Intelligence Report by AIM Group LLC, a market research firm.

While there are fewer ads than when Craigslist offered its erotic and adult services categories, in some markets, ads that appear to be for paid sex work are posted regularly, the report said.

“A quick check shows the ads are frequently and quickly flagged by the ‘community’ or perhaps competitors,” the report said. “Craigslist seems to take the ads down when they are posted, but some slip through.” The most salacious ads are often taken down within 10 minutes to an hour, said the report.

Craigslist did not immediately respond to a request for comment.

AIM Group, which focuses on the classified-advertising industry, also discovered ads or listings for escorts, body rubs and even call girls on sites including Facebook Inc. and the New York Times Co.’s

“Some ads or listings are extremely explicit; some are just suggestive,” the report said. “Some are paid; many are free; still others are pay-per-click.”

In response to the report, Facebook said it gives users the ability to provide immediate feedback on its ads and site, and encourages people to report anything they find offensive or misleading. The company also has a team dedicated to investigating these complaints, and content that violates the rules is removed.

“Facebook strives to create a trusted environment for everyone that uses our service,” Fred Wolens, a spokesman for Facebook, said in an e-mail.

Kristin Mason, a spokeswoman for the About Group, said these links to third-party sites are placed by independent contract writers who “are free to write and link to any site they deem useful to readers of that topic.”

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