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In a book to be released this week former radical Tim Shadbolt who became mayor of Waitemata and subsequently Invercargill mayor claims he shared a bed with Green MP Sue Kedgley, who was drunk at the time.
Shadbolt also admits he was unfaithful to his former wife, Miriam Cameron.
The Sunday Star-Times reported that both women questioned his accuracy.
Ms Cameron, who has publicly accused Shadbolt of beating her, told the newspaper it wasn't just one wrong bed he ended up in.
"There were plenty, right through his Waitemata mayoralty. One was a 17-year-old girl."
Shadbolt told the newspaper he didn't want to comment further on Cameron's claims of his infidelity but said he would one day break his silence on her allegations of domestic violence.
In the book, Shadbolt also describes his night with Kedgley.
He said he had always had a "crush" on her and when she turned up to a party at De Bretts Hotel in Auckland back in the 1980s, out of work and seemingly "insecure", he listened to her "sad story".
He claims he wrote her a cheque for $1 million to put on her mantelpiece so she could look at it when she felt down and say to herself she was a millionaire.
He says the pair ended up in the same room and Kedgley who, according to Shadbolt, had been "drowning her sorrows" fell asleep.
"Now I'm no moral paragon of virtue but I draw the line when someone is unconscious."
He claims nothing happened between them but Kedgley was furious in the morning, hissing "how could you?"
But Kedgley told the Star-Times: "I think he's spinning a great yarn."
She had a vague recollection of the party but says she was working at the time.
She remembered Shadbolt writing out the cheque.
"I thought that was hilarious."
To continue the joke, she attempted to cash it, which landed Shadbolt in trouble with the bank.
But the rest was an embellishment.
"I certainly don't remember anything about 'it'."
- NZPA