My own rule of thumb is that if one person makes the charge, you can't say one way or the other what really happened. But when one person makes a charge, and then other people start coming out of the woodwork making the same charge, it is likely true.
I recall many years ago some report about him cheating on his wife, and his claim that she forgave him for it.
I bet a lot of old geezers who pulled that sort of thing 30 years ago or so are quaking in their boots now, for fear they'll get Jimmy Savilled too. Or maybe they are arrogant SOBs who don't think it was wrong and aren't worried.
Arghhh!