I am into nice looking, groomed, proportionate, straight and uniform cock, not overly large, but not small, roughly 6-8 inches in length, cut or uncut.
I tend to like watching fit looking people, not overly muscled, anything involving a steroided up bull is a huge turn off, and I am not turned on by watching heavy guys.
Personally, I rarely consume porn because it rarely feels authentic, and without authenticity, it doesn't turn me on. I am not into 'bro culture', fake tits, fake tans, fake dialogue, fake moans, cheerleaders, nurses, schoolgirls, daddy/baby, step siblings, step relations, incest, rape play, rough sex, gangbangs, extortion/manipulation or female objectification (except if it is in the realm of bdsm).
When I do search and land on something I like, it tends to be well lit, high resolution, sensual erotica - something like 'my little swallow' - or involves bi/trans play, androgyny or sensual bdsm.
Personally, I have performed in a half dozen scenes with a full-time local content producer, it was definitely educational and she was a pleasure to work with, as were the guys I did a bi/gay scene.
For guys who are curious, you must be fully comfortable in your own skin and have erection and orgasm control. For the scenes I did, she wanted ten to twelve minutes of scene followed by the money shot - apparently the scene length preferred by male consumers of content.