Three of a woman's 46 personalities were sworn in at her rape trial and testified about a sexual encounter one of them had with a man in a car, but the personality involved said she did not know what sex was.

In her first day of testimony Wednesday, the woman revealed three of the personalities that had been described to jurors by her doctors in earlier in the extraordinary trial. Closing arguments were expected Thursday morning.After hearing from the 27-year-old woman's main personality and then from "Franny," a 32-year-old woman who had told the alleged assailant, Mark A. Peterson, 29, of Oshkosh, "We share the same body," "Jennifer" was sworn in.

"Jennifer," described as a fun-loving 20-year-old who likes music and dancing, waved at the jury and described having sex with Peterson in a car in an Oshkosh park June 11.

"I didn't know what he was doing," "Jennifer" told the jury in Winnebago County Circuit Court.

Asked if "Jennifer" and Peterson had sex, "Jennifer" responded, "I don't know. What's sex?"

District Attorney Joseph Paulus asked if she enjoyed the sex act and the woman responded, "Tell me what sex is and I'll tell you if I enjoyed it." After the district attorney explained the sex act, the woman responded, "I don't know what that means."

However, a psychiatrist appearing for the defense, Dr. Darold Treffort, testified that the woman is faking.

"What you have is a patient with a therapist-induced illness," he said.

He said multiple personality disorders are "the UFO band of psychiatry. There's a small band of believers and the rest of us never see any."

Treffort said people with split personalities do not lose touch with reality. He said Peterson should be acquitted because the woman still had control of her body.

Testifying as her primary personality, the woman said she had been in Oshkosh since 1986.