The woman told Sheffield Crown Court she was just 12 when she was picked up from a children's home and abused by Basharat Hussain and two other men.
She also said she had been taken to Blackpool and raped by several men.
Mr Hussain, who denies the claims, is one of seven people on trial over alleged child abuse in Rotherham.
The witness, who cannot be named due to the nature of the allegations, told jurors said she was first abused after she and a friend were taken out for a meal by Mr Hussain and a number of other Asian males.
She said: "I felt very grown up. They took us out and paid for the meal. I did not feel I could say no."
She went on to tell the court that she was taken to Blackpool aged 16 and made to work in a restaurant, in a move prosecutors say was orchestrated by Mr Hussain.
She said that she was kept there for several months and was forced to have sex most days.
She said that when she returned to Rotherham she discovered she had several sexually transmitted infections.
Arshid Hussain, 40, High Street, East Cowick, Goole, faces 30 charges, including five counts of rape.
Qurban Ali, 53, Clough Road, Rotherham, faces four charges, including rape and conspiracy to rape.
Majid Bostan, 37, Ledsham Road, Rotherham faces one charge of indecent assault.
Sajid Bostan, 38,  Broom Avenue, Rotherham faces seven charges, including four counts of rape,.
Basharat Hussain, 39, of no fixed abode, faces 15 charges including two counts of rape.
Karen MacGregor, 58,  Barnsley Road, Wath, South Yorkshire, faces four charges, including conspiracy to rape.
Shelley Davies, 40, Wainwright Road, Kimberworth Park, Rotherham, faces three charges, including conspiracy to rape.
Cross-examining the witness on behalf of Mr Hussain, Gillian Batts said: "The truth of the situation is you've never met Basharat Hussain have you?"
The witness replied: "Yes I have."
It is alleged Mr Hussain was one of seven people involved in the sexual exploitation of children between 1987 and 2003.
It is claimed the children were "targeted, sexualised and, in some instances, subjected to acts of a degrading and violent nature".
The trial continues.

The remark was directed at a woman in the audience who had criticised Mr Martelly and his administration.
According to Haitian media, Mr Martelly told her to "go get a man and go into the bushes" at the rally in Miragoane.
A presidential adviser said Mr Martelly's words had been distorted.
Mr Martelly, who is in the final year of his five-year-term, is a former singer of Haitian dance music known for his flamboyant style and sometimes colourful language.
The row was triggered by President Martelly's reaction to a woman at a campaign rally in the port city of Miragoane on 29 July.
The woman complained about the failure of the government to provide electricity to her area, prompting Mr Martelly's hostile response, which in turn was greeted by cheers and clapping from the audience.
In response to the incident, Women's Affairs Minister Yves Rose Morquette, Social Affairs Minister Victor Benoit and Secretary of State for Alphabetisation Mozart Clerisson announced on Wednesday that they would step down from their posts.
They all belong to the Fusion of Haitian Social Democrats party, which is part of the governing coalition.
Party leader Edmonde Supplice Beauzile said Mr Martelly's behaviour was "unbecoming" to a head of state.
Ms Supplice Beauzile is running for president in the upcoming presidential election in October, in which Mr Martelly will not be able to stand again.
She said that "by insulting this woman, he has insulted all Haitian women".
"Such behaviour is a shame for the country," she added.
She also urged voters to "punish" candidates for Mr Martelly's party standing in Sunday's legislative election.
An alleged victim of child sexual exploitation in Rotherham said she felt she had no choice when asked to perform sex acts on several men.
[NEXT_CONCEPT]
Three officials in Haiti's governing coalition announced their resignation on Wednesday in protest at a remark President Michel Martelly made at a campaign rally last week.