Charlie Sheen claimed he didn't start having sex with men until 2011, but a transgender porn star alleged he was involved in romps with guys years before that, RadarOnline.com can exclusively report.

Meghan Chavalier said that the 60-year-old actor hired her and several other gender-blurring friends for pan-sexual orgies dating back to "1997, 1998," and performed a sex act on a pal's boyfriend during one encounter. Article continues below advertisement

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Chavalier claimed in her 2007 book, Confessions of a Transsexual Porn Star : "A guy called and said he wanted to party. My friend told him there were three of us there, and he was interested in all of us!"

When the Platoon star arrived "obviously drunk a

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