Found gay porn on my friends computer. is he gay?

Really want your guys insight on this. To start off, I am gay. I have a really good friend who I always thought was straight. He seems very straight and has never given me any indication to think that he's gay, or bi. I was on his computer and admittedly I did a bit of snooping, and found quite a lot of gay furry comics, and some gay porn too. There was also a lot of straight porn, but I was completely surprised to see so many gay furry comics. I'm thinking about it, and I just don't see why anyone who's completely straight would read gay sex comics. Not that it matters, of course it doesn't he's my friend either way, but I would like to get your guys opinions.