A man who abused boys along with a man dubbed "Britain's worst paedophile" has been jailed for 15 years.
Police said Norsworthy had other victims who had not come forward
Peter Norsworthy, 60, from Plymouth, was found guilty of raping, indecently assaulting and intimidating a number of teenage boys between 1992 and 2001.
He tempted the youngsters by offering them drink, drugs or companionship.
Plymouth Crown Court heard Norsworthy sometimes abused victims with William Goad, who was jailed in October 2004 for abusing boys over a 30-year period.
Norsworthy, of Taunton Avenue, was found guilty on 13 counts, including nine of rape, three of indecent assault and one of intimidation.
He was sentenced to 14 years for eight specimen counts of rape, four years for one count of rape and one year for each of the three indecent assaults, with all the sentences to run concurrently.
He was also convicted of intimidating one of his victims and sentenced to 12 months, to run consecutively.
His time spent on remand of a year and 109 days will count towards the sentence.
Sentencing, Mr Justice Jack said: "You are a predatory paedophile who puts a real risk to the long-term psychological well being of your victims."
The court heard how Norsworthy tempted vulnerable boys into his home. He then used his position of influence to abuse them, or drugged them before raping them.
'Scratching the surface'
After the sentence, the mothers of two victims spoke of the devastation Norsworthy had caused, saying: "He has taken away our sons' lives. He has taken away our lives. "
They said their sons had turned to alcohol, drugs and crime and had not known why.
Det Sgt John Livingstone, of Devon and Cornwall Police, said that he felt there were victims of Norsworthy who had not been able to come forward and he believed they were only just "scratching the surface" of what had happened.
But he added that the verdict was "the right result."
He said the investigation into Norsworthy came out of Operation Emotion, the inquiry that convicted William Goad.
Goad was sentenced to life in October 2004 after pleading guilty to 14 counts of serious sexual assault and two counts of indecent assault on young boys over a 30-year period.