In contract law, one of the general defenses to non-performance is unconscionability. That's when a contract contains something in it which is so misleading, or unfair, or immoral, that no reasonable person in her right mind would freely consent to it if they knew the facts of it. Eating vomit, on the face of it, is something that a reasonable person would not do except under extreme duress, meaning, unless they were totally forced to do it by circumstances. Is not dating unconscionable? It might be sorta messed up, but in the real world plenty of people don't date, or think dating is wrong for young people to do. I get that lots of people don't agree with this kind of restriction, but it doesn't seem unconscionable to me.
Another reason why eating vomit would not normally be put into the terms of a contract, at least going by general US law, is that it would be considered against public policy. Meaning that, the general policy of the government is in requesting that its citizens maintain good health. If they are being asked to do something which is unhealthy as part of a contract, then that would make either that clause severable (ignore just that rule) or the entire contract voidable (throw the whole thing out). The party who signed the contract wouldn't have to obey something so disgusting, and could not get fired for not obeying it. Except
maybe in New York.
Moving on, I hate to get all "internet debate team" on you, but I'm sure you know this argument is a rather naked slippery-slope fallacy. My sister was a waitress at Macceptable's restaurant. Macceptable's would not allow its waitstaff to wear disgusting torn and tattered clothing; they had to wear a uniform which had to be reasonably clean, pressed and in good repair. That's obviously UNFAIR for them to impose any conditions on their employees, right? Because what if, instead of having to put on clean clothes every morning, they had to eat a fresh bowl of vomit every morning? Same diff, right? Um, no. At the very least, seems reasonable to me that a family restaurant has a valid business-related interest in its staff being clean and sanitary, and that such conditions are not unduly burdensome.
Finally, there's the fact that idols work in the entertainment industry, where the rules of the game are somewhat different than they are in ordinary life. For example, for a normal job you would not typically be required to stay within 5 kilos of a certain weight. Your boss doesn't care how much you weigh, just if you can do the job. But if you're working on a $200 million movie, you might be required to maintain a certain weight range as terms of the contract. Er, sorry Joseph Gordon-Levitt, you're gonna have to lose that little gut ASAP. We need you as BATman, not as FATman.
Also, in entertainment, there are certain "
morals clauses" which are almost always placed into contracts. The purpose of this for the business to make sure that if their star starts to act up, they can cut him or her loose before they totally destroy the image of the company. For example, Tiger Woods had endorsement deals with Gillette and GM that were terminated because he violated the morals clauses. With a normal job, your boss doesn't usually fire you if you have an affair, but Gillette didn't want their brand image commingled with that of a philanderer. WHY CAN'T TIGER WOODS HAVE A GIRLFRIEND? Well, he could, but he lost some gigs as a result. Same thing with idols. The morals clause doesn't allow them to smoke, have boyfriends, get tattoos, etc. They probably even need permission before dyeing their hair or getting it cut. Imagine if Miyabi got her hair cut in a
Cassie Cut . That would probably be hotter than fuck. But I bet UF would have something to say if she did it without getting the ok first. She might even get "demoted" to a kenshuusei.