I remember he actually wrote on his Twitter he doesn't define himself. For me, he has an open sexuality (like Pan). He obviously feels aroused around other guys, even though it seems to be something more visual or just about touching.
Not every gay or bi guys likes to suck dick. I'm bisexual man, with preference in guys, but in the beginning of my sexual life, even though I had very clear interest on man, I had some aversion on putting a dick in my mouth. To this day, I only like sucking if I think the dick is beautiful.
And for me, personally, I really don't care about his sexuality. His videos are very sensual and that's what matters for me. I was attracted to him even when he was just doing purely straight porn. But I can't deny they are getting better an better. I hope he bottoms for a guy some day on video.
BTW, I'd love to watch that last video, the threesome.