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Charlie Sheen is opening up about his past sexual encounters with other men ... and he says it's "liberating" to tell his story.

In an upcoming Netflix documentary about his life, Charlie says he decided to try something new and he started having sex with men after years of banging women.

According to People , Charlie explains it like this in the doc ... "I flipped the menu over." The interviewer then asks Charlie how it feels to talk publicly about having sex with men for the first time, and he responds, "Liberating. It's f***ing liberating."

Charlie claims he started having sex with men when he was in the throes of drug addiction ... namely, when he was smoking crack. Gallery Books

He says his crack use "started it ... That's where it was born, or sparke

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