My husband's fantasy

So my husband recently told me he has had this fantasy for a while now and im glad he expressed it to me but thing is i can't get myself to even consider it...he wants to me to have sex with a person (male of course)n him watch I've told him it's cheating and he disagrees he says to him cheating is an emotional connection to the other person and this wouldn't be... would u lady's consider it? What do u guys think? Don't be rude either I'm looking for honest opinions