Honestly, I love to watch guys jerking off so I tend to watch gay porn. I can watch a ridiculous amount of solo guy masturbation before I get bored of it. Then I'll move on to some of the very few b/g hardcore stuff that turns me on (no overly buff, super tan guys, no slapping your cock on her ass before you stick it back in her, no super made up girls with obviously fake tits, please guys, stop moaning like that, I feel like you're going to take a dump) or some tentacle porn or anime stuff.
There are only a few girls who I think are hot who I don't know (I get shy around a girl if I've masturbated to her) and I am only turned on by g/g stuff or most fetish stuff when I'm participating in it (can't watch it later, ewwie, do I really look like that?!). Sometimes I like b/b porn, but I don't like muscle guys or guys who look underage and I don't like buttsecks, so...narrow margin again. Every once in a while I flirt with the idea of getting a subscription to Boundgods or tsseduction (kink.com's gay and tranny sites) because I generally like the stuff that they put out.