As well as impacting on his family, it would have exposed his failure to adhere to police vetting procedures, which required him to reveal changes in his circumstances which could lay him open to blackmail.
The 16-page report disclosed that at least one colleague warned Todd of rumours about him.
It said: "It is clear that the personal life of Michael Todd was complicated and that some relationships with women, both platonic and otherwise, lasted over many years.
"The affect of these relationships on Michael Todd's family and the service must not be underestimated and one can only speculate as to their effects on him as an individual.
"However, there is no evidence that these relationships affected the day to day discharge of his duties as Chief Constable."
It added that his personal lifestyle brought with it "significant potential" for compromise to him and had "adversely impacted upon the reputation of the Police service".
Todd's wife Carolyn, 47, continued to stand by her late husband.
In a statement released through the police, she said: "Michael was not just a dedicated police officer, but also a loving father and husband. He is deeply missed."
Although no women are named in the report and many declined to be interviewed, several relationships have come to light since his death.
Todd is said to have made advances towards Laura Nagulapalli, 41, a former stewardess and model who worked as a constable in Manchester.
He had a relationship with fellow officer Julia Wortley, 43, while they worked for Scotland Yard and during a period in which he had split temporarily from his wife.
Another ex-girlfriend with whom he was said to have had a platonic relationship in London was Tracy Clarke, who he worked alongside at Colindale police station in north-west London. In the late 1990s, detectives had received a "tip-off'' accusing Miss Clarke of providing a known criminal, facing trial for assault, with the addresses of witnesses.
She was put under surveillance and had her phone tapped, leading Todd to call her from a pay phone to warn her about the investigation. Miss Clarke was eventually exonerated.
An inquest in October concluded that Todd, who had taken a cocktail of drink and sleeping tablets, had not committed suicide but died of exposure on Mount Snowdon while in turmoil over his private life.
The report found no wrongdoing in the promotion of GMP staff to senior positions and the use of GMP equipment, including computers, vehicles, and phones.
It cleared Mr Todd of any inappropriate behaviour regarding his expenses, hospitality, gifts, travel and accommodation.
Paul Murphy, the GMP authority chairman, praised Mr Todd's leadership of the force but added: "The enquiry has raised questions over the former chief constable's judgement and integrity. We must acknowledge that the report states Michael's failure to fully disclose the extent of his extra marital affairs made him potentially vulnerable to compromise and that had the full extent of the extra marital affairs been made known, his vetting status would have been reviewed."
The report also hinted at contradictions and attempts to cover up how widely known Todd's affairs were.
Rumours of his love life were an open secret among many officers and the report established that he had a "wide range of relationships with different women".
"Some categorically deny any intimate behaviour, whereas others have acknowledged an 'affair' or sexual encounter," it stated.
However his inner circle of senior officers denied knowing anything of the relationships.
The report said a meeting was held between Mr Todd and another officer where "rumours" of an affair were talked about but he "denied any impropriety". The woman involved was spoken to by the investigators and denied the rumour, the report said.
Source : http://www.telegraph.co.uk/news/uknews/4578579/Manchester-police-chief-constable-Mike-Todds-affairs-damaged-police-reputation.html