In the movie "The Truman Show", the show takes place in the fictional town of Seahaven. However this town is actually located in California. One would assume that the governing laws of California would also govern Seahaven, even if indirectly.
The current laws of California regard prostitution as a crime. If this is the case, wouldn't the actress Hannah Gill who is playing Meryl Burbank (Truman's wife) be guilty of prostitution as she is being paid to have sex with Truman as his "wife"? One might argue that she is legally married to Truman but I do not believe this to be the case since 1) He does not even know where he "really" lives and 2) he does he even know her "real" name. One may also argue that she is just having consensual sex but according to the film every time she sleeps with Truman she gets an extra $10,000. That clearly indicates she is getting paid to sleep with Truman. On the same token couldn't Christof (or the corporation) be charged as her pimp?
The way that would have worked, if at all, and leaving aside Truman not knowing about the show, was as Actors and contracts. Let's say an actor decides to do a film. Contract states that actor must indulge in sexual scenes for the show, and if they do, they get an incentive/bonus for their 'performance'. This is legal, since it's still acting, consensual, and not prostitution since this is a pre-planned activity as part of a film (as opposed to two people indulging in sex with money involved).