So, normally speaking, I think James Callis is an attractive guy, but he's not my archetype of male perfection physically. He's handsome enough, and his charisma certainly makes him incredibly attractive, but I've never seen him and been like, swoon, James Callis.
Ohhhhhh my sweet lord, CHECK HIM OUT. His bone structure! And his brooding eyes! AND HIS JAUNTY FEDORA, AND HIS DEVIL-MAY-CARE CIGARETTE!
So now I'm just picturing Dr Gaius Baltar walking around like he's from the Twenties, and that's why Caprica was totally enchanted by him, at least at first. But, no, seriously, LOOK AT HIM. Damn.