A married police officer in Manchester accused of sleeping with three prostitutes while on duty has resigned.
PC Darren Bromley is said to have got to know the sex workers while patrolling the city's red light district, the Manchester Evening News reports.
Suspicions were raised when he was spotted allegedly visiting one of their homes.
Bromley, 38, is under investigation by Greater Manchester Police's standards unit and has been arrested on suspicion of misconduct in a public office.
The officer had been on restricted duties due to the allegations, but quit two weeks ago.
He initially denied the allegations and has been bailed until a court hearing in February.
Chief Superintendent Nick Adderley, of the Greater Manchester Police (GMP) said: "Prostitutes are vulnerable people and we will go to any lengths it takes to unearth any individuals guilty of this sort of thing and get them out of this organisation.
"Where possible we will push hard for a conviction against any police officer we find to be engaged in this type of activity."
A police spokesman said: "GMP's Professional Standards Branch are investigating three separate allegations that a police officer had a sexual relationship with three women whilst on duty. The offences took place on different occasions.
"A 38-year-old man was arrested on suspicion of misconduct in a public office. He remains on police bail until 4 February 2015.
"He was placed on restricted duties but has subsequently resigned."
The case was passed to the Independent Police Complaints Commission twice at the start of the year, it is understood.
A spokesman confirmed it had looked into the matter and passed it back to GMP to investigate under its supervision.
Bromley is the second GMP officer to be charged with alleged inappropriate sexual activity.
In August PC Kevin Dwer, 39, was charged with two counts of voyeurism and ten counts of outraging public decency. His case continues.