In no particular order.
1. Sex abuse, like when a girl vomit and they keep continuing.
2. Monster costumed sex scene. I mean when the guy wear a demonic mask, ect. I don't mind if it realistic costumes like a pirates or cops.
3. Camera time on a guy's face or him masturbating while the girl is stripping.
4. Bondage, foot fetishes or anything like that.
5. Anal sex, I don't know... I just don't get any excitement by watching anal sex. I don't see why so much people want their favorite pornstar to do their first anal. I guess it just taste and until it the pornstar who choosed to do it, I don't really mind it.
6. Music, especially if we can't hear orgasmes. The main reason I didn't appreciate Fever Island.
7. Scene cutting, like they were in the Doggy Style and the screen goes black and then they immediatly in the Missionary position. I just feel I didn't got the whole sex scene and got ripped off my money.
8. Scripts, if done right like in Pirate, I don't mind it. Other then that I feel like it a waste of time. And I don't really like to fast forward often.
9. Girl over-exagerate and make it obvious she is faking.
10. Multiple guy and 1 girl. Especially if there like 5 guys masturbating around her while the girl do a fellatio to 1 guy and handjob 2 other guys.