A former prostitute has said that ex-IMF chief Dominique Strauss-Kahn (DSK) insisted on having anal sex with her at an orgy even though she made it clear she "didn't like sexual practices like that", a court has heard.

"Mounia", a prostitute at the time of the incident, said it took place in Paris with at least three other prostitutes.

"I cried a lot.... DSK must have been aware that I was unhappy," she said.

Earlier on Tuesday (10 February), three topless protesters from the Femen radical feminist group jumped on the car of DSK outside the French court where he testified on charges of pimping.

The bare-chested protesters, who were shouting "the clients are convicted", were immediately blocked by Lille security guards and carried away. They had "pimps, clients, guilty" painted on their chests and "your turn to be f****d".

Strauss-Kahn, 65, was forced to resign from the IMF and abandon hopes to run for French president in 2012, after he was accused of rape by a maid at a luxury New York hotel in 2011. The charges against him were later dropped.

Judges in the northern city of Lille allege Strauss-Kahn participated in a prostitution ring centred on the Carlton Hotel, where orgies described as "carnage with mattresses all over the floor" were held.

He denies any accusations, claiming that he did not know that the women who took part in group sex were prostitutes.

If convicted, Strauss-Kahn faces a maximum of 10 years in jail and a fine of up to €1.5m (£1.29m).