What if I change my mind in the middle of a shoot?
Then something needs to stop or change.
That sounds obvious, but it is worth saying because people can treat a signed booking like a machine that now has to run to the end. Real people do not work like that.
Something can sound completely fine in messages and feel different when you are actually standing there doing it. A position can hurt. An angle can feel far more exposing than expected. A line can sound ridiculous out loud. A sexual act you thought would be easy can suddenly feel wrong with a camera two metres away.
Say it.
"Stop." "I don't want to do this." "Can we change it?" "I need a minute." Those are enough.
Good planning reduces surprises, but it does not eliminate the fact that humans react to reality rather than to the version of reality they imagined in a chat.
A production should be able to pause, change an angle, remove an idea or abandon a scene without turning it into a personal crisis. Some of the best work comes from adjusting to what is actually happening rather than trying to force the original plan through a person who is no longer comfortable with it.
There is a separate issue that often gets mixed into this question. Stopping something during filming and changing what happens to material already filmed are not the same thing. The second question depends on the agreement and the law that applies. The first question is immediate: if an activity needs to stop, it stops.
My rule is simple. STOP means stop. Not "one more because the camera missed it". Not "just finish this angle". Stop.
That rule is not there because I want the set to feel clinical. It is there because people relax more when they know they can speak normally. Nobody should spend half the shoot silently calculating whether saying something will create drama.
If a scene changes because somebody speaks up, fine. The camera will survive.
Sometimes changing one small thing saves the whole scene. Move the camera. Change the position. Take five minutes. Drop a line. Put clothes back on for the acting section and return to the explicit material later. A production that has only one possible path is fragile anyway.
I also think this is easier on a small set because communication does not have to travel through three departments before anything changes. The person can say something directly, we solve it, and the work continues if she still wants it to.