Major turnoff background noise and chatter from the actor or the camera crew.
Milfhunter is the worst at this. Cancelled my subscription to RK, because of this.
HUGE turnoff is when a name is said during a video or live session.
Case in point, is Lisa Ann's POV release on the website naughty america. NA had one of the best actresses that stays near the top five on freeones most popular and pornstar books top 48 constantly and the video was completely ruined. The whole time she kept saying brett this and brett that. Nikki Dominik's POV release also had the same problem. No guy wants to hear another guys name being said!
Other turn off's in porn is bad boob jobs, gangbangs, dp, groups, and bondage stuff.
Music on a video that completely cuts out sounds.
Moderate turn off's is tons of piercings and tattoo's.
Another minimal turn off is definately short hair. I like women with medium to long hair, shoulder length or more. To give you a better idea... Mason Moore, Rachel Starr, Rachel Roxxx, Ariella Fererra, Diana Prince, Lisa Ann, Julia Ann+. Mason takes the number one spot though as the absolute hottest black haired beauty in porn.
We all have our likes and dislikes.