A recently-surfaced videotape is reportedly uncovering a whole new side of Johnny Carson his estate would rather keep under wraps.  TMZ cites "multiple sources" who say a sex tape from the 1970s, starring the late "Tonight Show" host and one of his wives, is being shopped around to private collectors.  The owner of the tape reportedly approached Carson's estate last fall to make a deal for the footage but the estate threatened to sue if the racy tape was ever sold.  With that threat looming, the owner is shopping it to private collectors instead of a porn distributor.  

Although the late night comedian was notoriously private about his personal life, a recent tell-all book written by Carson's longtime lawyer Henry Bushkin reveals a rather copious side of "Carnac."  Carson retired from show business in 1992.  He died in 2005 at the age of 79.