@Buttermilk,
Interesting response.
Yes, I agree, the simulation is the emotional portrayal of a character. However, the kiss is real as real can be. For instance, if the person your spouse is to kiss for a film has a cold sore disease, your spouses lip's do not draw a boundary line saying she won't get infected. The same for sex on film, the sperm will fertilize the egg regardless of how much someone was paid for a movie.
So, although I agree it's up to each individual relationship to set up their own specifications for what constitutes being unfaithful, that does not mean the logic they used to set it up is not faulted, or based on a false premise.
For you, Buttermilk, who believes passionately kissing someone other than your spouse is adultery/infidelity; you would be wrong to allow such actions be performed if someone were paying you. Because, you are essentially saying your values can be bought. And if all it takes is money and a big screen to sell your values of kissing, it may just take a bigger screen and more money to sell your value for, other things.
The way I see it. The persons body that you marry is priceless. Their lips, their hands, their legs, their hair, their entire body is priceless. Anyone willing to sell any part of their body, is getting a really shitty deal. So no amount of money is worth letting someone else's lips touch my wife's.