Four 'flashing' incidents have been reported in the last few weeks.
Police are investigating a string of indecent exposures outside St Clare's School on the Banbury Road.
They say the incidents all happened late at night, between the 24th of November, and the 1st of December.
The offender is described as a White man, in his forties, with dark hair.
He was wearing a brown jacket and khaki trousers.
Investigating officer, PC Daniel Hayward is appealing for any information, urging witnesses to call 101 quoting reference 43170354553.