Strauss-Kahn returned to France in early September 2011 after the charges against him in New York were dropped when New York prosecutors said they couldn't prove beyond a reasonable doubt that the former IMF chief had attacked the maid, Nafissatou Diallo. DSK has admitted to a "moral failing" in his interaction with Nafissatou Diallo but has denied he raped or assaulted her.
According to French news reports, DSK allegedly was invited to parties by the prostitution ring that took place in Paris as well as in Washington—with the last one taking place in the U.S. capital just days before DSK's ill-fated trip to New York. The reports allege the expenses were covered by the prostitution ring.
A person familiar with the matter confirmed that "prostitutes were brought from France for these parties," saying there were at least "three trips to the U.S. which were for orgies." The person said the "last trip was just before the Sofitel case."
Paying prostitutes isn't illegal in France, but encouraging prostitution by offering them to others and using corporate funds to pay for them is.