My sexuality is a bit comprehensive, but I have a tendency to watch more hetero porn, when I do. It's rare though. I find porn so unrealistic most of the time that I normally watch it to entertain myself rather than to get off. The only reason why I prefer hetero a bit more is because my body understands the motions of what's going on on a carnal level, and being pretty open about nudity leads me to need harder sex, usually, to even think of getting off.
Although, if it's for reading porn, or porn of a specific series, I have a tendency to lean toward male/male pairs, mainly because I have a tendency to gravitate toward male characters more. But I love male/female and female/female pairs just as much. I suppose, to get the actual gratification I need, I need to feel the connection between the characters enacting to really make enjoying porn an experience.