Zoe Adams, 19, has dressed up as a clown and put a pillow over Kieran Bewick's head to make their encounter more exhilarating on July 29 last year, Carlisle Crown Court heard.
In what she described as an "overreaction", she whispered, "Trust me", to the then 17-year-old Bewick before stabbing him five times in the chest, arm and thigh with a 10-inch knife, collapsing his lung.
Having seized Adams' iPhone, the court heard of images she had saved on the device, which included a blood-soaked woman with the caption "Murder is like a bag of chips: you can't stop after just one".
The device also had a text message to her victim reading: "I don't think about males unless said male is strapped up and being used as a human sacrifice - you should be grateful you are not part of it."
Adams claimed she could not remember the incident, but sentencing, Judge James Adkin said her "cruel and sadistic" actions were deliberately intended to cause harm to her victim.
He added that she planned the attack, taking the knife and duct tape to her bedroom in Wigton, Cumbria.
Mr Bewick, who is afraid of clowns, had declined Adams' earlier suggestion to be tied up with the tape, and the pillow was a compromise.
Jusge Adkin said: "You had decided to cause serious harm to Mr Bewick during sex.
"I am sure that by that time you had already become disinhibited by drink and drugs and the more sadistic side of your personality had come to dominate," said Judge Adkin, ruling that Adams is a dangerous offender.
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