This is great in principle, as any mistakes etc are generally not edited out; in real life, people make mistakes.
The trouble is I'd imagine it's a difficult scene to shoot according to time frame; what if the guy has wood issues? Not bloody likely, seeing as he popped a pill a hour before and has been on a horn before the camera was even taken out of the damn bag.
What if the chick ain't wet enough? I suppose she douches a tube of water-based before the camera rolls. Anybody have "inside" knowledge?
What if the caverject'd dude can't blow a load, and must jerk off for about 3 hours before reaching the point of no return? I've seen scenes where this happens, and the girl is there bored out of her tree as the guy is flexing like a jackhammer on fast-forward.
Personally, I think there should be a camera which films everything from start to finish, to be included in the BTS.
I had my fun and that's all that matters.

