B.C. law professor Benjamin Perrin wants the Alberta government to demand Craigslist remove prostitution ads from its website. ((CBC))

A law professor from the University of British Columbia is calling on the Alberta government to crack down on Craigslist.

Benjamin Perrin says Craigslist is a hot spot to sell sex, including sex with children.

He says the free erotic services ads are being used for sex trafficking.

Perrin calls it an online "flesh market."

"I am absolutely appalled that the only government (west) of Quebec to not make this demand is the government of Alberta and it's not because they're not aware of the problem," Perrin said.

"I have no idea why Premier Stelmach's government is not taking this up against the advice of the Calgary police service." 

Perrin has written a book about human trafficking called "Invisible Chains: Canada's Underground World of Human Trafficking."

Craigslist shut down its prostitution ads in the United States in September after complaints from attorneys general in 17 U.S. states.

At least three Canadian provinces say they want Craigslist to remove the ads.

A West Vancouver man was charged in August with luring a child under 14 after police found an ad on Craigslist in which a man was seeking to meet a school-age girl for sex.

Alberta's department of justice has yet to respond.