Sadly, cheating is common in a marriage – but it's usually not with a close family member.
One woman has confessed to doing the dirty with her husband's father on the kitchen table, where the family usually have dinner together.
Speaking to Kidspot , she confessed to having "pity sex" with her father-in-law, but maintains it all began "in the most innocent way".
The woman, who hasn't revealed her name, explained that she's been happily married to her husband for five years and they have a daughter together.
She began by saying she is not proud of this story, and if her husband finds out the "marriage will be over".
The family had been happy until a few months ago, until tragedy struck: her husband's mum died of cancer at just 52.
Her father-in-law came to stay for a while as he was lonely and finding it difficult to cope alone – initially planning on staying for a month or so.
Because her in-laws had always been "wonderful" to her she wanted to do whatever she could to help out.
When her husband went away for a few days, her father-in-law was great at looking after their daughter around the house.
One night they stayed up later than usual, drinking as he showed her photos of his late wife from when they were in high school together.
"I know it’s no excuse but the whiskey was flowing and I just felt relaxed and let my guard down," she said.
"He was so sad and when I gave him a big hug, things started to feel intimate.
"Before I knew what was happening, his mouth was on mine and then clothes were flying everywhere and we were having sex on my kitchen table. The place where I sit and eat breakfast with my husband and daughter every morning."
The mum said it was over quickly and they went to their separate beds.
Although she glares at him, she says she's scared to speak out in case he says anything to her husband.
Now the father-in-law has been living with them for three months and shows no signs of leaving – she feels like this is "punishment" for what she has done and says she deserves it.