OLATHE, Kan. — After hearing from witnesses about John E. Robinson Sr.'s fondness for sadomasochistic trysts, jurors saw it for themselves Monday morning when prosecuters played a 39-minute video of him having sex with one of his alleged victims.

The tape shows Suzette Trouten, a 27-year-old Michigan woman whose body was later discovered in a barrel on Robinson's rural property, stretched out naked on her hotel-room bed, the radio playing in the background. Robinson joins her several minutes later.

"Do you know what it means to be a slave?" asks Robinson, who used the name "Slavemaster" when meeting women in Internet chat rooms. "Your body belongs to me. You're going to serve your master every morning ... and every night."

"Oh yes, master," she answers.

During their session, Robinson slaps Trouten several times. She shows Robinson how to use a medical device to administer electrical shocks to various parts of her anatomy.

Some of the seven female and five male jurors were clearly uncomfortable watching the video. One middle-aged woman held her hand over her mouth throughout and briefly covered her eyes. Robinson sat with his chin in his right palm, nervously stroking his cheek with one finger.

The video, discovered in June 2000 in a brown briefcase in Robinson's Olathe storage locker, was admitted into evidence only after a lengthy discussion between prosecutors and the defense. It is believed to have been taken in the Guesthouse Suites hotel room in Lenexa, Kan., where Trouten stayed for two weeks before disappearing March 1, 2000.

District Attorney Paul Morrison said he wanted to show a nine-minute edited version of the tape to be sensitive to the jury, adding that he would be glad to make the full tape available to them if they wanted to watch it during deliberations.

But defense lawyer Sean O'Brien objected, saying the edited version put Robinson's conduct in the worst possible light. He noted that the edited version showed Robinson using the medical device to administer electrical shocks to Trouten but didn't include the portion where she teaches him how to use the device. "The full tape shows bizarre sexual practices between two consenting adults," he said. "The edited tape doesn't do that. We believe the jury should see the entire tape or nothing at all.

After hearing their arguments, Judge John Anderson III sided with the defense. "There's no question the content is relevant," he said. "If the defense wants the entire tape played, the entire tape will be played. This is the fair thing to do."

Robinson is on trial for two counts of capital murder in the deaths of Trouten and Izabela Lewicka, a 21-year-old Indiana woman whose body was also found stuffed into a second barrel on Robinson's rural Kansas property. In addition, he is charged with murdering Lisa Stasi and arranging for his brother to adopt Stasi's 4-month-old daughter, Tiffany, in 1985. (The state did not have the death penalty at that time.) Once the Kansas trial is completed, Robinson faces charges of killing the three women in Missouri.

A former correspondent for Newsweek and People Weekly, Sue Miller Wiltz is currently writing a book about Robinson for Pinnacle Books. She is covering the trial for Courttv.com.