arabian

I think it's a combination of his charisma, his incredible acting talent, his voice and his eyes and the fact that the latter two help to create such a dramatic, romantic, sweeping kind of character. Whenever he's given a role that requires him to be madly in love with someone (see "Jude" -- or rather don't if you don't want your heart ripped out in a million pieces), you believe so completely, your heart aches for him. And it's impossible to NOT be swept up in that romantic fervor. He sells it so well.

But then he sells everything so well, he's just THAT damn good.