BBC.A father repeatedly raped his two daughters during a campaign of abuse which resulted in 19 pregnancies, a court has heard.
The 56-year-old, of Sheffield, had earlier pleaded guilty to 25 rapes and four indecent assaults.
The attacks led to nine children being born, two of whom died. The other 10 pregnancies were miscarried or aborted.
Sheffield Crown Court was told he "took pleasure" in knowing the harm he was doing to his daughters.
The court heard that the father, who cannot be named for legal reasons, threatened them with a "real hiding" if they refused to have sex with him.
Nicholas Campbell QC said: "All the defendant's children spoke of his domination over their family life. He was tall and strongly built."
Mr Campbell said the father "liked to think that he was the hard man".
He added: "All the family were frightened of him. When they heard his car pulling up outside the house, the children and their mother ran to their respective rooms."
He will be sentenced later.
First I've heard of this. Sick s***