But here's the thing for me (everybody else's mileage may vary, obviously).
Way early on, Sean Cody did a video called "The Experiment", two straight guys having sex (I forget the names of the guys involved. Dylan and Eric, maybe?). The scene reflected this - both guys were very hesitant. The sex was as mechanical as it gets. The guys barely touched each other (other than absolutely necessary when, y'know, having sex with somebody), and were terrified to even look at each other, keeping their eyes desperately focussed on the porn in the background. The scene was over and everybody ran for the hills.
Contrast, say, "Josh and Dru" (hell, let's go watch "Josh and Dru" just for the fun of it). Mr Fisher has told us that both Josh and Dru are straight (Josh said he was into women in his profile video, and I'm sure I can remember a write-up for Dru that he liked Latin women).
And I'm not even talking about the sex-scene (as scorching hot as it was). I'm talking about part 2, the shower scene afterwards. The two guys are just mauling each other. Dru's just trying to devour Josh. And you know, the scene's over, they're not really getting paid anymore, they're just showering off before going to get some lunch. And Dru spends the entire clip looking like he's a second away from bending Josh over and going again.
(to be fair, if any of us had Josh naked, soapy and wet, all to ourselves, we'd probably be about to do the same*)
But that's my point.
I'm not arguing that there's no straight guys at CF, because obviously there are (who are exhibitionists, closetted, curious, comfortable enough with their sexuality, or else desperately penniless enough, to appear in gay porn).
But you said it yourself. This is a business, and Mr Fisher has to sell this line (regardless of whether it's true or not) to make money.
Again, I don't doubt there are straight guys. But you can't determine a model's sexuality by what Corbin tells you.
* -- it's not that Dru has gay sex on camera, it's that he enjoys it so much. Maybe it's just me, but whenever Dru's on camera, my gaydar just explodes. That's the read I get from him. It's entirely a subjective thing and I can't explain it beyond that, but yeah.
Look at the grin on his face as he's getting spit-roasted by Elijah and Simon. Or the way he devours Josh (at one point asking Josh, "Maybe next time you can top me?" Yeah. That's a heterosexual thing to say).
(hell, watch "Dru and Austin". During the interview segment, Dru and Corbin both mention this rule that apparently prohibits the models from hooking-up off-camera. Here's the head-scratcher. If the heterosexual men need to be told not to have sex, off-camera, then I doubt they're 100% heterosexual)