I think Giamatti is one of the sexiest guys working in Hollywood today. Thing is, he doesn't play the roles that are considered "sexy," and he's not the usual Hollywood idea of sexy, so he gets no press for being a handsome guy hiding behind a pair of geeky glasses. I've only seen him in Planet Of The Apes and Storytelling, and in both cases he was too immersed in the character (esp. the monkey one) to look like himself, but then I've seen him in magazines and whatnot since then, and I have to say, he is seriously a cutie.
So yes, Two Lane Blacktop is gay and would do Paul Giamatti. There it is.