A witness in the Arthur Allan Thomas sexual assault trial says he has tried to block out the memories of being involved in historical abuse.
Thomas, who was pardoned over the unsolved murders of Jeanette and Harvey Crewe, faces one charge of rape and four charges of indecent assault, relating to two complainants.
He strongly denies the accusations.
The court this week heard evidence from two of the complainants.
A man, who has permanent name suppression, today gave evidence about his involvement in some of the incidents. A recorded police interview from 2019 was played in court.
In the video, he claimed Thomas encouraged him to engage in sexual acts with the women, including having penetrative sex with them.
He said Thomas was allegedly "showing and telling us how to do it all".
The man said he was ashamed of his actions and he tried to block it out of his memory.
"It haunts me what happened, that I was part of whatever you'd like to call it," he said.
"Over the years it has played on my mind."
During cross examination, defence lawyer Marie Dyhrberg QC, suggested that Thomas was not involved in the sexual acts.
The man said that he would not "make up a load of bull".
The trial continues before Judge Bergseng and a jury in the Manukau District Court.