Ewan McGregor is an international treasure. And today happens to be his 51st birthday. Before he dazzled our screens as the somewhat salty version of Obi-Wan Kenobi, the Scottish actor appealed to my more…alternative preferences in his earlier films. I'm talking about the David Bowie-inspired Velvet Goldmine , in which McGregor plays a character based on Iggy Pop. His acting is great, but my friends and I were more interested in the full-frontal nudity he displayed during a raucous rock and rol…