After weeks of extraordinary public fixation, Indonesian police Tuesday arrested Nazril "Ariel" Irham on charges related to a sex video scandal involving the singer and two female celebrities, one of them his girlfriend Luna Maya, 26. All three, including Irham, Luna and another television show host, Cut Tari, 32, were scheduled Wednesday to undergo anatomical and dental examinations to be compared with the videos, which reportedly were taken off Irham's computer hard disk by so-far unknown persons. Because he is the lead singer with a group called Peterpan, the films have inevitably been dubbed Peterporn.