Meanwhile, Strauss-Kahn's past conduct with other women is getting new scrutiny.
The banker was investigated internally by the IMF following a 2008 affair with an employee, the Hungarian-born economist Piroska Nagy. The institution eventually absolved him of wrongdoing, but on Tuesday a person close to Nagy said she had sent the organization a letter at the time warning about his behavior toward women.
The letter voiced "doubts about Dominique Strauss-Kahn's suitability for running an international institution," according to the person, who declined to be identified, citing the sensitivity of the matter.
The New York Times published an excerpt of the letter, along with an account that said Strauss-Kahn had aggressively pursued Nagy, sent her sexually explicit messages and once had her summoned from the bathroom to speak to him.
Strauss-Kahn himself appeared to realize that his relationships with women could be a political problem. The French daily newspaper Liberation reported this week that at a meeting with Strauss-Kahn in April, he speculated that his presidential campaign might be subjected to low blows over "money, women and my Jewishness."
"Yes, I love women ... so what?" the newspaper quoted him as saying.
Strauss-Kahn also theorized that his enemies might try to pay someone to accuse him of rape, according to the newspaper.
Strauss-Kahn's American lawyer, Benjamin Brafman, said Monday that he believes that once all of the physical evidence is in, his client will be exonerated.
All prisoners arriving at Rikers Island are given a mental health assessment to determine whether they pose a suicide risk. Norman Seabrook, president of the guards union, said Strauss-Kahn did or said something during that evaluation that made doctors concerned, and he is being monitored day and night.
Because of his stature, Strauss-Kahn has been assigned to a section of the Rikers Island jail that normally houses prisoners with highly contagious diseases, like measles or tuberculosis. Corrections spokesman Stephen Morello said Strauss-Kahn has been placed in a wing with about 14 cells, all of them empty except for his.
The cell has a toilet and a sink. He takes his meals there, with breakfast at 5 am, lunch at 11 am and dinner at 4 p.m. or 5 pm.
Morello said Strauss-Kahn is free to leave his cell from time to time and wander the wing, and can leave the building for an hour each day for recreation outdoors, if he wants. Because he is awaiting trial, Strauss-Kahn isn't required to wear a prison uniform. He may bring his own clothing and wear what he chooses, except for his shoes. All prisoners are required to wear prison-issue slip-on sneakers.
Also, he must change out of his street clothes and put on a gray jumpsuit when he wishes to see visitors. The suits are designed without pockets or other hiding places where a person could stash contraband.
Strauss-Kahn is charged with attempted rape, sex abuse, a criminal sex act, unlawful imprisonment and forcible touching. The most serious charge carries five to 25 years in prison.