A former Humberside police officer has pleaded guilty to four counts of sexual assault and four counts of misconduct in a public office at Sheffield Crown Court.
Lee Kershaw was a police constable working at Hornsea Police Station. He was dismissed from the force in May 2009.
Detective Superintendent Mathew Hutchinson said: "Lee Kershaw abused the trust that was placed in him as a police officer and committed a number of very serious offences.
"I would like to praise the victims for their bravery.
"Coming forward to report allegations such as these can be extraordinarily difficult and these women have demonstrated real tenacity and courage.
"Humberside Police would always encourage and support victims to report crime, whoever the offender may be."