I found tranny porn on my boyfriends computer (alot) what should i do?

Hello, So I have been in a great relationship for over a year now and recently found some weird porn on my boyfriends computer. I didn't watch the vids I just looked at the titles in the history I saw a bunch of stuff like Tranny gets it while jerking it, tranny sex, shemales having fun...so on so on. I don't know what to make of this. I don't want to confront him (yet) because I dis-respected his privacy so I kinda feel like a snoop and feel like he will get really mad, and also it's kind of embarrassing for both (mostly for him.)
I read on some other sites and on here that alot of guys do this, and are not gay.
I'm wondering If anyone can give me their opinion, don't just say HES GAY or something stupid like that cuz he's not. I'm looking for some insight and some meaningful opinions and advice.
thanks