Mairead Philpott tells the court that she started having sex with other men before Christmas.
She says Mick was always present and that he would encourage it and agreed he would get involved.
On the night of the fire, Mairead says she had sex with fellow defendant Paul Mosely - something Mick would "encourage and join in" with.
This had taken place before the fire and Mairead said she felt "disgusted" afterwards, but that she did it to make Mick happy.
She says she was "really hurt" when Mick asked her for a divorce, but that she never thought about leaving.
More top news
The vessel went missing last week with 44 sailors on board.
Joined by 18 Labour MPs, McDonnell voted with 283 Conservatives, eight DUP and two independents to defeat the Taxation Bill amendment.
Gerry Adams has told UTV the “time is right” for him to step aside as president of Sinn Féin, after announcing that he would do so in 2018.