This is also why I really LIKE the addition of gay models to the cast as it gives more credence to the idea that at least one of them is enjoying it, though, realistically, it's not any less mechanical for the gay guy with all the camera cuts and direction. And if I were a gay guy, and the model I was with, had to turn to female porn at every camera cut and jerk himself to get it up, I think I would feel insulted and that would cut my own enjoyment of the scene.
One of CF's strengths, for me, is that sense of 'You guys just do your thing while we roll cameras', which is so much hotter than everything feeling staged. There seemed to be an earlier time where there was more of a sense of this. I remember reading write-ups where its like 'these guys are so into it, we just let them go and tried to keep up'. Now, how much of that was bullshit I don't know, but it did feel that way at times. (I'm thinking of scenes like Brent/Dillan or Travis/Derk's Bel Ami scene) where it did feel like the actors were completely focused on each other and not doing things just for the camera. The most recent scenes, though they are fancier, have more of a staged feeling, especially with all the strange positions.
If there was a website where they just filmed gay couples having sex for real, I would find that hotter than any of this stuff. But alas that is not the porn industry. I find though that the scenes which can create at least some of that illusion for me are the ones I keep. The rest are disposable.