Long, uncomfortable silences.
Especially the more modern cumshot/finisher trend in which a male performer will tug away on his member, and we have to watch the lucky big dick dick bastard, who just fucked this hot girl, pull on his cock for the final two or over four minutes. There was an old Big Naturals scene/episode with the (once before she ruined herself) Daphne Rosen, in which the final nearly 4 minutes, was just the male actor jackin' it over her fact and tits.
Utterly sad and painfully non-sexy and non-arousing to watch. We'll all jackin' it to porn to, ya know, get off. And so we all most certainly don't need to be reminded of it or shown in.
Also, I'm quite a supportor or retro scenes and hunting them down online, but WHAT the fuck gives with the unusually large number of strange & creepy Incest storylines? No shit, I've seen like 3 or 4 in the last year of looking up entire retro movies online (late '70s and first half of the '80s when stuff was still shot on 35mm film) that is a MAJOR turn-off for me. Sorry, just don't find that shit stimulating.
Also, any of those long over-the-hill-lucky bastards that are way too old to fuck younger broads and to shoot they're own interview & mini Gonzo segments stuff. Guys like Randy West and Ed Powers and the like. Blah, who wants to see them fuck younger broads? Creepy at this point.