Gary Tate rejected the offer after much consideration because he thought it "felt so wrong", but admits the businessman was very keen for him to do the deed with his wife to celebrate her 40th birthday because she is "mad" about the Hollywood actor.
He said: "When I asked why he would want me to do that, he said, 'We have an open relationship, she's mad about Clooney, and I can't get him so I'm asking you.'
"When I turned him down, he upped his offer to £5 500. I ummed and ahhed about it but turned him down."
(Image: Twitter)