Emerson Estridge was branded a "sexual predator in uniform" after he abused his position to target vulnerable women he met during his line of work as a response officer for West Midlands Police.
A court heard the 45-year-old cop took advantage of his role to pursue personal relationships with victims for his own sexual gratification.
Estridge - who boasted he provided "good customer service"- sent flirtatious texts and photos to the women and had sex on one occasion while on duty.
He also messaged them via Whatsapp discussing swingers clubs, baby oil, meeting up in hotels for drinks and videos that he had of himself performing a sex act.
He resigned from the force in June 2019 after the allegations came to light and later pleaded guilty to four charges of corrupt and improper use of police powers.
On Monday Estridge, of Leamington Spa, Warwickshire was jailed for 18 months at Birmingham Crown Court.
Judge Dean Kershaw described him as a "sexual predator in uniform" and told him his actions could damage the trust the public had in the police.
The court was told Estridge served as a response constable in Solihull, West Midlands, but moved to an operational support unit shortly before he was arrested in March.
He targeted four different women who were either witnesses or victims of crime between September 2016 and November 2018.
An internal disciplinary hearing held on July 2, 2019, found Estridge would have been dismissed had he not resigned.
Deputy Chief Constable Vanessa Jardine said after the case: "Estridge took advantage of his position as a member of West Midlands Police to pursue improper relationships for sexual and emotional gain.
"This was completely unacceptable and a clear breach of the standards of professional behaviour.
"A proactive investigation by our Counter Corruption Unit identified the gravity of offending and led to Estridge pleading guilty.
"It is disappointing we've recently seen two ex-colleagues convicted after developing inappropriate relationships with people they've met while at work.
"There is no place for this type of behaviour in our organisation.
"Estridge abused his position, his actions were appalling and my thoughts are with the people affected by them.
"Serving and protecting the public is paramount and it is vital that our communities have the utmost trust and confidence in everything that we do."
If you or somebody you know has been affected by this story, contact Victim Support for free, confidential advice on 0845 30 30 900 or visit their website, www.victimsupport.org.uk.