Girls licking guys or girls' asses! Also girls licking guys' balls - who wants to see this? Also licking a guys' balls doesn't turn him on at all...
Jon Dough's "Watch him cum in her mouth and then see her spit it back into his" movies! I do like watching girls swallow cum but the girl spitting the cum back into the guys' mouth just seems a bit urrgh! I'm sure the girls would be happy to see that the guys would swallow cum too though.
Also watching sex scenes in really uncomfortable places like on the carpet on the floor or out in the cold warehouse - what is it actually like performing in these types of conditions? I'd like to see more sex scenes on a bed or similar
Guys who are too loud during sex eg Ed Powers. I want to listen to the girl more than the guy