Generally porn is a job just like any other. It is made up of humans so not everyone is going to be thair best selves all the time but most are. What you see is made up and edited. What you don’t normally see is the director and the performers going through a plan on what they are going to do before they do it but this can depend on the studio. Some studios have a shot by shot set of sex positions and a plan for the scene while others they may just start rolling and see where things go.

What stops things is the law and people taking. You probably don’t want to know the details but https://en.m.wikipedia.org/wiki/GirlsDoPorn where there are people in jail for a long time for sex trafficking, fraud and coercion.

There are also a few other cases where people talk out in public against a performer or a director and they will have a hard time getting work in the future. An examples of this are Jimmy lifestyles who was the director for wankzvr a few years ago. Alex coal made an allegation of something happening after the shoot and he is no longer working for the company and the company employs someone on set to make sure that everyone is acting up to standard.