I do video interviews with all the girls I shoot. I ask a majority of pertinent questions, such as shoe size, ticklishness, prior foot worship experience. Basically the really good stuff relating to shoe and foot fetish. I let them know their fans don't care if they ever kissed a girl before, or want to know what their favorite position is.
BTS is better for big mainstream production. I saw some JB Video BTS, and it bored me. There were usually 2-3 people involved, and no set up, lunch break, or other types of BTS stuff. And the post interviews were terrible, as they always revolve around straight sex instead of the fetish that was shot.
Randy West did good interviews. Ed Powers did very good interviews. And his after shoot scenes were pretty good too.
I saw post interviews on kink.com, and they undid everything I saw in the videos. It looked as though the girls were being tortured to death, and would be pissed afterward. But then they sat down and sounded all happy and cheery in post, which totally went against the effect the video produced.
Anyone remember "Stir Crazy"? The guard thought they were torturing Skip, but he loved every minute of it. And sometimes requested more.
To acheive good BTS results with the stuff we shoot, the camera would have to be rolling the moment the girl walks in the door. And if we really want to go all out, have a second camera and shoot video of the actual video.
This store has BTS clips
http://www.clips4sale.com/studio/32364