is bored :V
I agree, oversized stuff is a turn off for me....hell, I'm not even that fond of overtly sized tits IRL let alone in ma yiffies
All of those.. including most fake bullshit (moaning, boobs, muscles, tan, attitude, so on.) douchebaggery, most serious humiliation.. and other things I can't think of. Uggos maybe. :<Horrible gross things that are an instant bonerkill to stumble across accidentally: Poor hygeine, bathroom stuff, bestiality, infantilism and/or cub, mutilation and guro.
Things that are not necessarily a bonerkill to see but are still too weird to get off to: Badly drawn porn, ultra-fatties (curves are nice, rolls are not), ridiculous musculature, extreme macro/micro, bizzare transformations, pregnancy (male or otherwise), inflation, vore, cocks/tits bigger than your torso, and other physical impossibilities.
Anything else is generally OK, even if it's not a personal kink of mine.