Hazel Stewart and Colin Howell accused their partners of beating them in bogus statements they gave to police following the apparent suicide.
The lovers claimed they were both victims of domestic violence in the false accounts they provided to detectives in the days after the funerals of their spouses Lesley Howell and Trevor Buchanan, the court was told.
Coleraine Crown Court heard Stewart has already admitted to police that she and Howell concocted alibis to make officers |believe that her husband and his wife had taken their own lives, when in fact they were murdered.
But as the full transcripts of those original statements were read out at the mother-of-two's double murder trial in Coleraine, it emerged they also told the |police they had been beaten by their partners.
Both claimed they struck them in anger over their infidelity.
“Trevor would have hit me and I would have hit him in return,” Stewart told officers at the time.
“I never received medical attention as such, but I received bruising to my face, arms and legs.”
Howell, who has pleaded guilty to the double murder, told officers that his wife Lesley had attacked him when he had told her about the affair eight months before her death.
“It manifested itself in fierce verbal and physical abuse directed towards me,” he said.
But the dentist insisted he hadn't retaliated.
“I never hit Lesley, it was always one-sided,” he said.
Howell told detectives his wife hit him on two further occasions in the weeks prior to her apparent suicide, as her mental state deteriorated in the wake of her father's death.
The statements were read out by the officer who led the original police investigation into the deaths, Jack Hutchinson, who was then a Detective Inspector in the RUC.
Both statements outlined the version of events Howell and Stewart had allegedly agreed on in the wake of the killings.
Howell even went into detail about what Mr Buchanan had said to him in this made-up encounter.
“When he saw me he referred |to my sexual relationship with Hazel in strong language, asking me if I had enjoyed it,” he told officers.
Both Howell and Stewart then claimed to have woken up the following morning and found their partners gone.