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
An unofficial adviser to Hillary Clinton delivered a withering assessment of the then-new coalition government in 2010, emails reveal.
The first woman to be sentenced for revenge porn has escaped a jail term after publishing naked pictures of her girlfriend online.
Shoppers can make higher-value purchases with their contactless cards after the limit for a single payment rose from £20 to £30.