I miss where he said (even if jokingly) that him exposed his wife to others could be a form of payment for work provided. He is trying to sell you. This isn’t a kink. This is disrespect. Not something to joke about. Not a good thing if he has kids. Would he like someone to offer his daughter as a form of payment? I am not buying that he’s been a great husband. Good husband would have his wife’s safety and privacy as a priority. He clearly can’t care less.
Time to take this seriously and get to the bottom of this. This isn’t a game