I have a friend from high school that's obsessed with him too. Or at least she used to be. She also was obsessed with Keanu Reeves around the same time. Go figure. I've never seen the attraction to David Bowie but to each his/her own.
It's the pants. He's packing HEAT. Like seriously. He's also not "traditionally" sexy. In fact he's rather ugly facially, but he WORKS the sexy in attitude. I think that is his sex appeal, he's so confident and secure about who he is. I mean the man sported a Mullet, More make-up than a dime store hooker, high heels and glitter, GLITTER and was still oozing masculine confidence in that movie. Take that Edward Cullen.
http://knol.google.com