Dr Kenneth Thompson, 68, was alleged to have slept with a married mother during a string of sexual encounters at his surgery, saying it was "therapy" to help her deal with childhood abuse and saying it would "save her marriage".
He was accused of telling a second woman to walk around her home naked, discussed her sex life with her husband, drew pictures of genitalia and talked repeatedly about oral sex.
A third woman, said to be a rape victim, alleged Dr Thompson gave her four Viagra tablets from his briefcase after she complained of an abscess. He turned up at her home to perform an intimate examination, she alleged.
But the General Medical Council yesterday cleared the retired Belfast GP of misconduct after it was claimed the three women probably knew each other and were motivated by money to make the "implausible" allegations against the doctor.
Two of the women, known as Ms ST and Mrs EC, live close to each other and were parents at the same primary school
Mrs EC and a third alleged victim, Mrs MC, were said to be best friends.
The trio had consulted the same firm of solicitors to pursue a civil action against the doctor.
Dr Thompson last night said he was "extremely pleased" to have cleared his name.
"There has been a great burden on me and my family since the allegations were made and I am relieved that this matter is now over.
"I would like to thank my wife, family and friends for their support during this difficult time.
"I would now like to put this behind me and enjoy the rest of my retirement with my family."
Dr Roger Ferguson, chairman of the fitness to practise panel held in Manchester, said there was "spectre of collusion" over the case.
He told Dr Thompson's barrister, Andrew Hockton: "You submitted that where there are serious, multiple inconsistencies, they must undermine credibility and reliability."
"This is a case which goes back many years and the events in question took place a long time ago. You submitted that the allegations made against Dr Thompson were implausible and a possible motivation for making them was for the money the complainants had been told they would make from bringing a civil suit.
"You also raised the spectre of collusion. The Panel has considered all the oral and documentary evidence adduced and has concluded that there is a real risk of contamination and/or collusion between the three complainants, whether inadvertent or otherwise."
Mrs EC alleged that in 2003 she had sex with Dr Thompson after confiding to him that she had suffered sexual abuse as a child. She had claimed that he offered therapy for sexual relations problems with her husband that included performing sexual acts on him.
Mrs MC told the panel she had approached Dr Thompson after being recommended by Mrs EC. She said she felt "dirty and disgusted" after he told her to walk around the house without any clothes on and to have baths with her children.
Ms ST said she had been the victim of rape when she was 18. In a consultation in June 2004 she said Dr Thompson opened his briefcase and gave her four Viagra tablets, telling her to take one at night. She claimed he would turn up at her home, once giving her an injection in the buttocks and performed an intimate examination.
But Mr Ferguson said Ms ST was "confused" about the dates of the alleged offences. Mrs EC was on medication at the time and her evidence was not credible, he said. Inconsistencies in Mrs MC's evidence meant there was no "prima facie case against Dr Thompson".
His suspension was immediately lifted.
