A sexual assault victim fought back the tears to give evidence against her own mother in court.

Earlier this week Truro Crown Court heard how two “sexually deviant” naturists are said to have groomed and abused their children for their own sexual gratification, teaching them that it was “normal” to be naked in bed with their parents.

A woman in her fifties from Cornwall is currently on trial charged with three indecent assaults on a male, three counts of sexual activity with a child, four offering to supply Class B drugs charges, engaging in a sexual act in the presence of a child and twice causing or inciting a child under 13 to engage in sexual activity.

Her husband, in his late forties, has already admitted a string of charges relating to the abuse and started serving his sentence. However his wife denies being involved and contests the allegations against her.

To protect the identity of the victims Cornwall Live is calling the husband Mr X and the wife, defendant A.

The allegations are that defendant A had sex with her stepson on numerous occasion whilst he was under the age of 13 while Mr X (the male victim’s father) occasionally watched and pleasured himself.

He is also said to have been supplied with cannabis, encouraged to sunbathe naked with his parents and taken to nudist beaches and drug fuelled raves.

Mr X has already admitted the sexual touching of one of his step daughters, while the prosecution claims that defendant A and her husband also had sex in front of her.

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Defendant A is also alleged to have showed her daughter how to masturbate using a vibrator and encouraged her to touch her sleep button (her clitoris) when she couldn’t sleep as a child.

The daughter’s police video interview was played to the court as evidence, during which she regularly burst into tears.

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When asked about sexual touching by her stepfather she said: “I spent the night in my mum and step dad’s bed and halfway through the night he was touching between my legs under the duvet, touching me inappropriately with his hands. I completely froze and it carried on happening.

“This was just the first time and I don’t know how it progressed. He said I was his favourite.

“It happened for a few years and I don’t know when it crossed over but at some point my mum became involved in that. She was a part of it but it was very different. Now it’s just bits and bobs I remember. Mum didn’t do what he did.

“She said if I had trouble sleeping I could touch myself (sexually) as it would help me sleep. She called it my sleep button. I didn’t think it was weird until I was a bit older.

“For 12 years I kept it to myself as I didn’t want my reputation to be tarnished by them. I love my mum and she’s done so much for me and my sisters but she knew what was happening to me was wrong and she failed me there.”

During cross examination, the visibly distressed daughter reiterated that her mum and step father would have sex in front of her and make no effort to stop and that her mum taught her how to use a vibrator, demonstrating on herself.

Defendant A denies the charges against her. The trial continues.

Mr X will be sentenced at the end of his wife’s trial.