The case was heard at the High Court in Glasgow
John Steven, 38, thought he was going to have cement poured over his naked body by 34-year-old Sharon Kerr who agreed to carry out the act for £150.
But when he arrived at her apartment he was attacked by Craig Dalton, 33, and Matthew Harrison, 23, a court heard.
Mr Steven was hit with a machete and he heard the men discussing him being “chopped up.”
And he feared he would be hacked to death by Dalton and Harrison when they told him: “There’s no way you’ll get out.”
The High Court in Glasgow heard how Mr Steven was invited to Kerr’s flat after she told him she had access to a cement truck.
He went with her to a cash machine but when they returned she left and a woman calling herself “Michelle” turned up before Dalton and Harrison arrived.
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Machete attack victim John Steven had a concrete fetish
He was screaming for help and banging his hand on the window in an attempt to get help
Prosecutor Shanti Maguire said the woman disappeared from the room and Dalton and Harrison launched the terrifying attack on their hapless victim.
Miss Maguire told the court: “He recalls his left hand being struck and feeling like his thumb was hanging on a thread.
“He was terrified and thought that he was going to collapse.
“He was screaming for help and banging his hand on the window in an attempt to get help.
“The street appeared to be deserted.”
John Steven had paid for a sex session involving concrete but was then attacked by two machete thugs
Mr Steven, of Troon, Ayrshire, heard the pair discuss cutting him up and Harrison said: “What about the credit cards?”
The victim handed over two cards along with the PIN numbers.
Kerr returned and asked: “What the hell’s happened?” – then the trio fled and Mr Steven escaped from the flat.
Miss Maguire added: “He continued to scream for help before collapsing in the street.”
Mr Steven had multiple wounds to his hands, ear, cheek, chest and back as a result of the attack in Renfrew, near Glasgow.
His thumb was almost severed and he suffered a potentially fatal collapsed lung.
He spent 10 days in hospital, has lost the use of his left thumb and is scarred for life.
Police Scotand officers investigated the attack
Harrison admitted assaulting Mr Steven to his severe injury, permanent disfigurement and impairment.
Dalton admitted the same charge with the added accusation of endangering the victim’s life.
Both face lengthy jail terms when they are sentenced next month.
Dalton, Harrison and Kerr had attempted murder charges against them dropped.
All three had not guilty pleas accepted to a charge they conspired over six days to assault and rob Mr Steven, and pretended they had “access to a cement truck” and “cement mix to pour on him” to “induce” him to go to the flat.
Kerr, 34, admitted stealing £400 from Mr Steven’s bank account and will also be sentenced next month.
Prosecutors accepted not guilty pleas from Natalie Williamson, of Renfrew, to attempted murder and conspiracy to rob.
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