The Bush singer, who has been married to Gwen Stefani for seven years, allegedly had a love affair with pop singer Peter Robinson, who recorded under the name Marilyn.
According to Entertainment Wise, Robinson claimed that the star "was the love of my life".
"He was just becoming successful in America. I agreed to lie against every grain of my being," he said.
"We were together five years. But it felt like 40."
Boy George previously claimed that the pair were an item in his 1995 autobiography Take It Like A Man.
Marilyn achieved international success with his single 'Calling Your Name' in 1983.