Shocking details are being released about the sex lives of the super religious California 'house of horrors' couple David and Louise Turpin.

The Turpins were arrested a little more than a week ago after one of their thirteen children escaped the family's Perris home and called police to report that she and her sisters were being held against their will. Cops raided the home and found the couple hastily untying several of the children, who were shackled to beds.

The couple have pleaded not guilty to nearly 40 counts including torture, false imprisonment, abuse on a dependent, and child abuse. David faces an additional charge of a lewd act on a child under 14.

The charges came as a shock to Louise's sister, Teresa Robinette, who appeared on Megyn Kelly Today on Monday to discuss the case.

She said she had no idea the children were being treated like prisoners in their own home. However, she says she did know that her sister and brother-in-law had begun to engage in what she considered deviant sexual behavior.

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Teresa Robinette, the sister of California 'house of horrors' mother Louise Turpin, appeared on Megyn Kelly Today on Monday to discuss the case

Before they drifted apart, Robinette says she spoke to her sister on the phone often.

They really started to bond around Louise's 40th birthday, when the family quit the church and 'were experimenting with different religions'.

'At the time, she said...that the older children were helping take care of the younger children so her and David could sow the wild oats they didn't sow when they were younger,' Robinette says.

For example, Robinette says her sister called her the first time they went to a bar and got drunk.

But things quickly escalated and Robinette began to find the couple's behavior disturbing.

Robinette says that around 2009 or 2010, she got a call from her sister, saying she was going to sleep with a man she met online, with her husband's permission. Louise and David Turpin are pictured with their children at a vow renewal - one of the few times the kids were let out

Louise eloped with David Turpin after he signed her out of school and drove them to Texas when she was 16. The couple was caught and returned to their hometown to wed. Above they are seen in their wedding photo in Princeton, West Virginia in 1984

Around 2009 or 2010, she says she got one of these calls from her sister.

She says her sister told her of a plan she had, to sleep with a man she met online, with her husband's permission.

'It was a very weird thing to me, that I would never do,' Robinette said.

'She told me that her and David had met a man online from Huntsville, Alabama. And they were on their way there to meet him and that she was going to sleep with him. And that David was okay with that,' Robinette said.

WATCH: “My main hope is that I can put my arm around them and just tell them they have family that loves them that is not deranged. That this is what it is supposed to be like” #MegynTODAY pic.twitter.com/vAfOeoMgMc — Megyn Kelly TODAY (@MegynTODAY) January 22, 2018

Robinette teared up as she described being sexually abused as a child by a 'close family member'. she says the same family member abused her older sister as well

At one point, Kelly reached over to comfort Robinette as she grew emotional

Robinette said she told her sister she thought she was making a mistake, but that Louise went through with the plan anyway.

'What makes it weirder, is exactly one year to the date of the anniversary she did that, she called me and thought it was funny that David was taking her back to the exact same hotel room, the same everything, the exact same bed she slept with this man in, so that David could sleep with her in the same bed,' Robinette explained.

The Turpin children range in age from two years old to 29. This weekend, sources told Crime Watch Daily that investigators were considering conducting DNA testing to make sure the siblings are all related.

Robinette also grew emotional in the interview as she detailed how she and her sister were sexually abused by the same 'close family member'.

Robinette would not identify the family member, but said it was someone 'we should have loved and trusted' and who abused their mother as well.

After their arrests, Robinette says that her sister and brother-in-law are 'dead to me' but that she hopes to have a relationship with their children.

She says she already tried to get on a plane to go out and visit the kids, but that authorities have told her they need time to recover.

Louise and her husband (pictured in court last Thursday) each face nearly 40 charges related to the imprisonment of their children. David faces an additional charge of a lewd act on a child under 14

Robinette has only met the four eldest children in person, but met some of the younger kids in rare Skype conversations that her sister allowed her to have with the kids over the years.

She says she looks forward to getting to know them and introducing them to their cousins, her children.

'I hope that when they come out from where they're at now, our hope is that they're all - they can lead some sort of normal or happy existence.

'Obviously, they've never known happy, except maybe the older ones for a little while. My main hope is that I can put an arm around them and tell them that they have family that loves them, that's not deranged. This is what it's supposed to be like, you know?' she said.