So there seems to be at least a few sites who are using User input to create their scenes. in most cases, the range of options includes commenting on a scene or movie, polling and forums. I have a seen a few that I will comment on but does anyone know allows the most user contributed content to be made?
Here's a few I've noticed:
Brazzers - Brazzers uses a forums to get some of their ideas and pornstar requests. I'm not sure how many of these scenes get made or requests fulfilled I just know that they have had them for awhile.
Pornfidelity - Pornfidelity/Teenfidelity uses a simple questionnaire and poll at the top of their page asking what scenes you liked etc. Its pretty straight forward.
NuruNetwork - This one is the most impressive user input so far. Again, I have no idea how much of this stuff gets made but they have a pledge that says at least one of the user submitted scenes gets made a month (I think its 1 per site; Milking Table, Massage Parlor, Nuru) There's an opportunity to submit ideas, pornstar requests and there's a voting system. The best part is there are production updates that show what state the idea is in: Under Review, Scheduled for Production, In Production, Scene Online.
HardX - Uses a survey to collect some basic information about preferences (there's also a feedback option for email but I'm not sure if that's for suggestions for the site or for content).
To me, this represents the best possible use of the web for porn. Yes piracy is terrible and it's hurting the industry for sure but I think the ability to get this type of feedback from paying porn customers could be an opportunity for the studios that want to listen. Does anyone else know of other studios that do this and with what medium?

+ Edited to add HardX in list.
Edited by - NotMyRealName on May 10 2014