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How it works in these situations?

girls signed with the porn producers and are forced to do these scenes ... or have the option to choose to do it, they can refuse?

Porn is not a place where anyone is forced to anything !!! I know many girls who are coming back from set with old people without making it ... but also many does it and later to justified what they did, claim to have been forced. It's bullshit !!!

PW

Thanks for the answer Pierre.

I have seen very good acting in some porn movies.
A long time ago I saw a JAV BTS video. The woman drove up to a building in a car and went into the basement. She acted like she had been there before. She looked to be about 21 years old. She talked to the crew, then got on a sheet on the hard cement floor. An old man attacked her, grabbing her breasts and ass and trying to take her clothes off. She screamed for help and was crying. She looked like she was only 16 years old. It was very realistic. After about 5 min., the director called cut and everyone took a break. She lit a cigarette and talked with the crew. Then they went back to filming the scene with her crying and getting "raped". Then she was paid and left. Good BTS.
Once in great awhile there is great acting with REAL fear. I will never forget the 1972 cult classic: "The Last House on the Left". It was director Wes Craven's first film. The innocent 17 year old girl, Mari, was played by 21 year old Sandra Peabody. In one scene, she was so scared of the actors, she walked off the set. Wes Craven had to coax her back to finish the scene.
The remake of this movie pales in comparison. It is not scary or sexy, and not worth renting.