Let's see, there's quite a lot of annoying stuff in porn... I don't like:
- Too much foreplay (like over half the video dedicated to kissing, rubbing, BJs...) Of course, I can always skip to the fuckin' part. XD
- Background music
- Weird locations (rooftops, hospitals, churches WTF?)
- Too much ink (maybe a couple tatoos are fine, but I prefer natural skin), too many piercings or "excessive" body modifications (as was pointed out before)
- Clothes on (panties, bras, jockstraps, socks, etc.) Sex should be completely naked, unless it's the amateur, in public, better-hurry kind of thing.
- Cock rings and similar stuff. It's like "What's the problem, man? Can't you keep it up without that thing restricting blood flow?" XD
- Fake acting (too much gagging, shouting, moaning, fake orgasms...)
- Lame acting (when there's no chemistry at all and actors seem bored, with almost no physical contact besides the genitals)
- Too much rimming and ass-to-mouth... Yuk!
- BDSM and aggession, especially against girls in straight scenes (choking, throwing them around, spaniking too much or too hard, spitting).
- Excessive close-ups or POV or no faces at all. A little bit is fine, but I prefer to get the whole picture, including both actors' faces.
- Condoms (unless it's part of the fantasy, like in the "luring the str8 guy into gay sex for the first time" kinda thing)
- Pulling out when the title promised an internal shot... That's fake advertising!!!
Whoa, that was some list! In general I could apply the "less is more" principle, I guess.