Incest monster Josef Fritzl’s daughter told today how he made her act out sick sexual acts after forcing her to watch hard core pornography.

Shocked jurors at Fritzl’s trial heard his daughter Elisabeth spell out terrifying details of her ordeal during her 24 years of captivity.

Elisabeth, now 42, finally had her day in court through harrowing recordings made during a video link statement.

It was a pre-condition of her testimony that she would only testify against her father if she never saw him again.

So instead she gave 11 hours of excruciating evidence of her ordeal to prosecutors last year and these tapes were played in court.

Elisabeth told how her father would bring boxes of hardcore pornographic videos into the secret cellar and ordered her to act out the scenes in them in rape sessions that went on for hours.

The four-man, four-woman panel sitting in judgement on her father heard her tell how she stopped struggling against him because she knew her life depended on being co-operative with her jailer.

She also talks of how she suffered grave internal injuries from the oversized sex toys he used upon her.

In the agonising testimony, Elisabeth detailed the most crucial aspect of the case – the death of baby Michael in the darkness in 1996.

Michael died of breathing complications three days after birth. Fritzl casually tossed the child’s body in the stove used to heat the house.

Fritzl denies the child’s murder, and also denies enslaving his daughter but admits incest and false imprisonment.

And he pleaded ‘partially guilty’ to rape and to ‘massive coercion’ over threats to release poison gas to kill Elisabeth and their children if they ever tried to escape.

During the course of the trial this week, the court will hear evidence from social workers, police and construction experts about how Fritzl fooled the world for 24 long years.

None of the cellar family will testify in person, nor will Fritzl’s wife Rosemarie, who now lives alone in Linz and has begun divorce proceedings.