As opposite as George Bush and John Kerry may seem to be, they do share a common secret - one they've shared for decades. The secret: details of their membership in Skull and Bones, the elite Yale University society whose members include some of the most powerful men of the 20th century. Bonesmen, as they're called, are forbidden to reveal what goes on in their inner sanctum. Bones has included presidents, cabinet officers, spies, Supreme Court justices, [and] captains of industry. They'd responded to questions with utter silence until an enterprising Yale graduate, Alexandra Robbins, managed to penetrate the wall of silence in her book, Secrets of the Tomb. I spoke with about 100 members of Skull and Bones. They were members who were tired of the secrecy," says Robbins. "But probably twice that number hung up on me, harassed me, or threatened me." Skull and Bones, with all its ritual and macabre relics, was founded in 1832. Since then, it has chosen or "tapped" only 15 senior students a year who become ... lifetime members of the ultimate old boys' club. A lot of Bonesmen have gone on to positions of great power. President Bush ... tapped five fellow Bonesmen to join his administration. Bonesmen have [included] William Howard Taft, the 27th President; Henry Luce, the founder of Time Magazine; and W. Averell Harriman, the diplomat and confidant of U.S. presidents. Mr. Bush, like his father and grandfather before him, has refused to talk openly about Skull and Bones. But as a Bonesman, he was required to reveal his innermost secrets to his fellow Bones initiates. They're supposed to recount their entire sexual histories in ... a dimly-lit cozy room.