"You reacted by showing real and uncontrolled anger, and you decided to rape her to show her why it would be better to have sex with men than women. Her evidence made harrowing listening.
"That rape involved degradation and humiliation. The offence demonstrated your hostility towards her as a lesbian."
The father was also convicted of raping his other daughter during two decades of sexual abuse, The Mirror reports.
Judge Andrew Lockhart QC told the brute: "The court heard from both of these two women. They have both been severely psychologically damaged by your behaviour.
"Listening to (one of the victim's) evidence of her feeling of guilt at leaving her sister to face you was the most harrowing of evidence."
The judge ordered the rapist serve 21 years in jail after being found guilty of three rapes during the 1980s and 90s. He was also ordered to serve an additional five years in jail and to register as a sex offender for the rest of his life.
