"He was touching the boys and the boys were touching him," said Saravanu, who did not know where in Australia Collins lived.
It was illegal in Vanuatu to commit an act of indecency with a person aged under 13.
Collins' lawyer, Saling Stephens, said there was no evidence against his client.
"I'll be advising him to plead not guilty on all the charges. But at the moment we are waiting for the continuing investigation by the police."
He said it looked like most of the allegations were "just rumours".
"For the police to prove a case of indecent assault, there has to be evidence coming from someone over 18 years. It can't just come from kids saying 'he was touching me'.
"That's not the law. Eighteen is the age when a person is regarded as an adult and can properly make a decision as to what's right and wrong."
However, Alan Bell, executive director of Ecpat NZ, an organisation which aims to prevent the sexual exploitation of children, didn't believe a child's age affected his or her ability to make a complaint.
Vanuatu had ratified the United Nations Convention on the Rights of the Child, which protected children from any form of sexual exploitation.
"Each case should be received and investigated and a decision reached on evidence produced - not on the necessity to have an adult verify the complaint."
Collins will appear in court on December 13.
