IN Playboy next month, Lisa Marie Presley tells all. Elvis’s daughter will not be baring all, though. The men’s magazine is behaving with uncharacteristic modesty as it celebrates its 50th birthday. James Kaminsky, 42, the editor poached last year from the lads’ mag Maxim, is updating the middle-aged formula. There will be less full nudity and more semi-clad beauties with the approval of Hugh Hefner, Playboy’s roué founder and owner. “The reader would rather see a hot pictorial of Britney Spears that might not be completely nude, than a nude pictorial of somebody’s cousin,” Hefner said. Celebrities who are not...