I firmly agree the OP should encourage his wife to stop engaging in self-destructive behavior. (I also believe sex work is necessarily self-destructive, as it

I firmly agree the OP should encourage his wife to stop engaging in self-destructive behavior. (I also believe sex work is necessarily self-destructive, as it commodifies, commercializes and depersonalizes the closest, most intimate way of relating to and bonding with another human that we have.) Your phrasing of "why do you let your wife..." implies OP can and should control whether his wife does this self-destructive behavior. He can't, literally, and he should not try to. He is responsible for his choices, not hers. Yes, if he sees this as hurting her and he's not trying to persuade her to stop doing it, he's responsible for that inaction on his part, and I'd say he should take action. But, he needs to always remember he does not and should not control her.