Clive Davis — record exec, Rock and Roll Hall of Famer, talent scout and five-time Grammy-winner — is leaving nothing out of his autobiography, "The Soundtrack of My Life," including five juicy pages at the end that open up about his bisexuality.

Along with dishing on some secrets of musicians he's worked with (how did Janis Joplin want to seal the deal after signing?), the 80-year-old music mogul has detailed some of the gay relationships he's had during his long, respected career. He's been married and divorced twice, and admits that after his second marriage ended in 1985, he had dated men and women. He's been with the same male partner for the last seven years.

Davis told "Nightline" that he thinks bisexuality is "maligned and misunderstood." And when asked the playful "gay, straight or lying" adage, his answer was solid and matter-of-fact.

"I'm not lying," the former CBS Records president told "Nightline." "[Bisexuality] does exist. For over 50 years I never had sex with a male. It wasn't repressed. I had very good sexual relationships with women."

He writes that the first encounter with a man came during drunken night in the "era of Studio 54," a popular NYC nightclub in the late '70s. "On this night, after imbibing enough alcohol, I was open to responding to his sexual overtures," he wrote, adding it was a "welcome relief."

Davis, who has discovered acts like Kelly Clarkson, signed Bruce Springsteen and recorded the Notorious B.I.G., currently sits atop the industry as chief creative officer of Sony Music Entertainment. His autobiography hits bookstore shelves Tuesday (February 19).

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