Susanne Moeller said the move was meant to protest an anti-prostitution initiative undertaken by Copenhagen city hall.

The city, host of the December 7-18 UN climate summit, distributed postcards in Copenhagen's hotels that said "Be sustainable: Don't buy sex." It also sent letters to hotel managers inviting them to take measures to avoid prostitutes meeting clients in their establishments.

The prostitutes, whose work is not illegal in Denmark, promptly reacted to the move.

"All delegates who come to Copenhagen for the world climate summit will be able to use the postcards for payment after making a request on our website," Moeller, of the Danish association for the defense of sex workers, said.

"We do not expect many delegates (to make use of the offer), but we want to protest what we consider discrimination," Moeller said, adding the offer was good for the duration of the climate talks.

The Copenhagen summit aims to craft an international climate accord to replace the Kyoto protocol, which expires in 2012.

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