Former IMF chief ‘promised to teach mistress sex games if she attended orgies.

A mistress of Dominique Strauss-Kahn received a £900 pair of designer boots and the promise of “learning new sex games” in return for attending orgies, it is alleged.

The claim is a crucial part of the evidence in the former International Monetary Fund chief’s pimping trial which entered its second day in Lille, northern France, today.

Strauss-Kahn, 65, faces up to 10 years in prison if it is proven that he paid women to attend sex parties all over the world.

But the ‘girlfriend’, identified only as Sylvie, told police that if she became his regular mistress, he would reward her with presents and sex games, rather than cash.

This included Strauss-Kahn taking her to the Bois de Boulogne, the wood to the west of Paris, blindfolding her and “watching her” have sex with other men.

At the time, Strauss-Kahn was married to the multi-millionaire art heiress and journalist Anne Sinclair, 66, who divorced him last year.

According to the charge sheet in Lille, northern France, Strauss-Kahn was guilty of ‘aggravated pimping’, which means managing more than one prostitute.

He is specifically accused of ‘aiding, abetting or protecting’ the prostitution of seven women whom he slept with regularly.

But, in court documents, a number of ‘girlfriends’ admit they attended orgies organised by Strauss-Kahn, who was once seen being ‘entertained’ by up to eight women at one time at the Murat Hotel, in Paris.

Four prostitutes identified as Melanie, Mounia, Sabrina and Sandrine are civil plaintiffs in the case.

Socialist cabinet minister Segolene Royal, the mother of President Francois Hollande’s four children, asked that court proceedings be closed to the media, so children would not hear the sordid details, the court heard.

Strauss-Kahn denies all the charges. He admits attending ‘libertine parties’, but has insisted that he did not know any of the women involved were prostitutes.

The case continues.