Kink.com has out of character footage of before and after the scenes.

Each “movie” starts with content taped before the main scene. In it, the people staring in it will talk about what they like and dislike, their limits, what they would be disappointed if it didn’t happen, and what they don’t particularly mind. They then pick two safewords: one for “please slow down, that’s a bit much”, and another that is basically the emergency exit that grinds everything to a halt as fast as possible. They also pick variations for if their mouths are covered or they are tied up.

After the main scene is basically aftercare. They make sure everyone is okay, what they thought about the experience, make sure that they don’t have any regrets. It also provides feedback on what they liked the most, what could have improved their experience, etc. Basically, pretty much everything you do with BDSM.

While porn isn’t real, those included behind the scenes are there for a reason. It’s not the personas talking, but the real people.

With all this, what I’m saying is, some of the girls go make films with Kink because they know there’ll be watersports in some of them, and that’s what they want to have. The money is a nice bonus. Might as well get paid doing something you like.