You've just unknowingly invited me to persuade you to the fact that Dean is bi... or at least non-straight.
I don't write about it as elloquently as others... so I'll link you to my favorite post on the subject. (you'll have to replace the stars in the URL with the f-word. darn censor.)
http://the****ing-trenchcoat.tumblr...ugh-so-hard-when-people-say-that-dean-is-100=
I believe Dean is non-straight but afraid to admit it even to himself or give into his impulses because it's not what a typical "man's man" should do. (NOTE I DO NOT BELIEVE THAT BUT DEAN DOES) I feel we've seen a lot of canonical evidence of this... and I would LOVE the chance to ask Jensen if he checks out the guys intentionally or not. Like in Time After Time, there's this scene when he's on a street... here... another tumblr post:
http://zobothehob0.tumblr.com/post/20101891350/neraiutsuze-castielinbakerstreet That HAD to be intentional. And I know, checking out a guy doesn't automatically make a guy non-straight... but combined with everything else... I just feel there's too much canonical evidence for us to ignore.
I'd also like to mention that this is not because Destiel is my OTP. Yes, I ship Destiel with every fiber of my being... and yes, it is my OTP. But I do not think Destiel would, should, or ever could be canon like a lot of the fandom because I don't think it's realistic that Dean ever actually
accept his sexuality. I do not think that my belief that Dean is bi is a because of my shipping of Destiel. I think it's because there's so much canonical evidence that I couldn't ignore it.