A couple had an irrational fear of their 11-year-old son being gay.

So, over the course of years during the mid-1990s, the couple now in their sixties, would force the child to watch them have sex.

They also performed sexual acts on the child involving oral sex, touching the child’s genitals and forcing him to "suck on the step-mother’s nipples," in an attempt to educate him about heterosexual relationships.

The parents, who have not been named to protect their son's identity, made him watch them in bed and take part in various acts.

His father told police it was because he wanted to keep his son "on the straight and narrow".

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The boy initially told the police that he was being sexually assaulted in 1998 but his father denied it and lied to detectives and the boy was not believed. 

Years later the victim, now an adult aged in his 30s, complained again to the police and this time the father and the boy’s step-mother were both arrested.

The perverted father and the boy’s stepmother were jailed today for six years and nine years respectively. 

After the hearing, the victim said: "It’s been a long process, and I tried before. I tried when I was 16 and, obviously, I was made out to be a liar. 

"A lot of people will ask ‘why now?’ But it took me that long to convince myself that I had the courage to go through it all again. If my story can reach just one other person, I will be perfectly happy with that."