The late Beat It singer's unofficial biographer Ian Halperin claims to have spoken to two of the star's male lovers, including an actor named only as Lawrence.
Lawrence told the author: "He was very shy. But when he started to have sex, he was insatiable."
According to Halperin - who makes the allegations in his book 'Unmasked: The Final Years of Michael Jackson' - "virtually everyone" around the singer knew he was gay and he used to meet lovers in a run-down motel dressed as a woman.
One alleged lover said: "The very first time he had sex with me he said, 'The King of Pop's going to lick your lollipop.' I still laugh thinking about that."
Jackson moved to Los Angeles in 2007 and barely left his home, except to meet one of his lovers for secret liaisons.
A source told Halperin: "He met a construction worker and fell madly in love with him. Michael would leave the house in disguise, often dressed as a woman, and would go to meet his boyfriend at a motel that was one of Vegas' grungiest dives. Michael was broke. He struggled to put food on the table for his children. It was all he could afford then."