Police in Denmark have gone public with news that a female cyclist is being targeted by a man who masturbates onto her bicycle’s saddle while it is parked at a train station, hoping that media coverage will shame the perpetrator into stopping.

On five occasions now, all of them on a Wednesday, the 19-year-old woman has returned to Mørdrup Station to discover that her saddle has been targeted by the anonymous onanist, says The Copenhagen Post, citing a report from the tabloid newspaper Ekstra Bladet.

“At first I thought that it was some kind of sick joke, but when it happened for the third time I decided it was enough and reported it to the police. It’s bloody disgusting,” said the victim, who unsurprisingly does not want her identity to be known.

She also says that she believes children in a local primary school playground may be able to see the man as he commited the offence.

Henrik Hattel, assistant police commissioner for North Zealand, commented: “We’re hoping that this will get the freak to quit doing it. That’s the most important thing for us. It’s difficult to say how we should punish the man.”

It was not reported whether police were looking at other measures such as deploying camera surveillance or positioning officers nearby on a Wednesday.

Although the woman has not actually seen the perpetrator while he is engaged in his solitary act, assistant commissioner Henk believes that law relating to indecent exposure may apply in this case.

"Otherwise the woman wouldn’t have called us,” he explained. “Her decency has been violated on some kind of level.”

The Copenhagen Post, whose story has the rather arresting headline of ‘Woman stalked by serial bicycle-seat wanker,’ says that so far no witnesses have been found, nor have they tested the substance left on the saddle to confirm it actually is semen, however they have no doubts over the veracity of the victim’s report.