A white-van man beckoned a woman over to his vehicle then exposed himself, police have said.
The woman, in her 40s, was walking along Edington Road, Witney, at 2pm on Saturday when the man called out to her.
As she reached his van the man exposed himself to her.
Witney police are appealing to anyone who might have seen the man, or been a victim of this kind of crime but not reported their experience.
The flasher is described as white, aged 30-35, tall and skinny with short, blond hair and blue eyes.
He spoke with a local accent and was wearing a blue and white, horizontal-striped polo shirt and beige trousers.
Anyone with information should call Pc Nigel Lomas on 08458 505505 or Crimestoppers on 0800 555111.
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