Three further people have been arrested in connection with Operation Clover, an investigation into non-recent child sexual exploitation.
Two Rotherham women, aged 58 and 40, were arrested on suspicion of causing prostitution of a woman, false imprisonment, and aiding, abetting and procuring rape.
Both have been released on bail while the investigation continues.
A 52-year-old man, also from Rotherham, has been arrested on suspicion of rape, indecent assault, and procuring a female for prostitution.
He has been bailed while enquiries continue.
This now means 16 people have been arrested as part of Operation Clover, a joint investigation by South Yorkshire Police in partnership with Rotherham Metropolitan Borough Council and the Crown Prosecution Service.
Three of those have been charged with a total of 78 offences.
It is one of a number of non-recent child sexual exploitation investigations in Rotherham and South Yorkshire Police continues to work in partnership with Rotherham Metropolitan Borough Council and the Crown Prosecution Service.
The Senior Investigating Officer, Temporary Detective Chief Inspector Martin Tate, said: “This is a complex and protracted investigation with a vast amount of work still to do.
“I want to continue to encourage victims of all sexual crime to come forward - it takes huge courage and I would want to reassure anyone who does come forward that their complaints will be taken seriously and thoroughly investigated.”
Anyone with concerns about child sexual exploitation should contact the police on 101 or Crimestoppers anonymously on 0800 555 111. Always call 999 in an emergency.
You can also report child sexual exploitation online through the Child Exploitation and Online Protection Centre.