Adult Film Hiring Legally Speaking, How Does Pornography Differ From Prostitution In Payment For Sex?

Legally speaking, how does pornography differ from prostitution in payment for sex? - adult film hiring

If someone hires a prostitute and films, it is not illegal? And also how the audition and casting for adult movies? Why not consider the application for prostitution, if you are looking for someone to sex for money? These are serious questions, please only serious answers.