I'd be near certain that it isn't really happening.

Most of the stage shows with hypnotists do not really involve much hypnosis. It's more about the power of peer pressure... the hypnotist says stuff like "only really intelligent people can go fully under hypnosis" and the audience expects the person to act silly, so they mostly play along - and usually don't want to admit that they weren't "under trance" because then, they would be admitting they "weren't intelligent" or whatever.

That said, some people are more susceptible to suggestion than others and are easier to hypnotize, but you could not, for example, take someone who was opposed to doing porn, hypnotize them, and get them to get naked and whack off on camera, it simply isn't going to happen, in large part because the subconscious mind won't *allow* someone to fully go into trance unless there's a strong degree of trust between the hypnotherapist and the client.

My guess is that if you *portray* that, but put somewhere in your TOS that it's fake, you're probably OK.