Court paperwork filed Tuesday seeks to disqualify Matt Ballard and other prosecutors in his office on grounds the relationships jeopardize the Bixby High School students' chance of a fair trial.
The four teens charged have pleaded not guilty to second-degree rape by instrumentation. Their attorneys say there was "roughhousing" but no assault. The Associated Press is not naming the defendants because they may be tried as juveniles.
Ballard said in a statement he won't step aside.
Prosecutors also are investigating whether school officials took too long to tell police after a 16-year-old boy said he was assaulted in September with a pool cue.
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