was unable to have children because he was sterile, it has been alleged.
The late pop icon - who has three children, Prince Michael I, 12, Paris, 11, and seven-year-old Prince Michael II, who is also known as 'Blanket' - reportedly confided in his physician Dr. Arnold Klein that he was left infertile from vicious beatings handed out by his father Joe Jackson when he was younger.
Arnold's former lover Paul Gohranson alleges Joe repeatedly kicked his son in the testicles - ruining his chances of having a baby naturally.
Paul also claims dermatologist Arnold, who was a close friend of the 'Thriller' singer, donated his sperm to Michael - who repeatedly claimed his dad physically abused him throughout his childhood - so he could have a family.
He told RadarOnline: "He told Dr. Klein that he thinks that's where the damage was done because he said his testicle was never the same again.
"He said it was enlarged and was always painful. So that's why he said Arnold donated his sperm because he didn't have the ability to even donate sperm, he wasn't producing it anymore."
Paul is adamant Arnold is the biological father of Prince Michael I and Paris.
Michael's ex-wife Debbie Rowe, who worked for Arnold, is the biological mother of the two kids.
Paul also claims Debbie had no idea her former employer had donated his sperm, but eventually discovered the truth during her marriage to Michael.
He added: "According to Arnold, Michael and Debbie had come to a business agreement, the marriage was supposed to be the cover to have the children. As far as what I understand Debbie was never meant to know who the sperm donor was, she was supposed to believe that Michael donated the sperm because, apparently, he hadn't shared with her that he couldn't have kids."