The man was reportedly spotted exposing himself and masturbating near to Warmsworth Cemetery yesterday.
A post on Facebook said: “Heads up, my friend has just come from jogging down the river with her friend and on her return, coming back at the top of the steps at the disused railway bridge near the cemetery, they were confronted by a guy who was walking.
"He turned round, dropped his joggers and proceeded to masturbate in front of them.
"He seemed very pleased with himself and the fact he had frightened them
"Be careful. Been reported to police.”
Paths near to the cemetery in Guest Lane are popular with walkers and joggers heading to the nearby River Don.
We have contacted South Yorkshire Police for further details about the incident.