To say that this is a shock to you would be an understatement, and you're not sure what to say.
"Do ... do you mean you want an ... open marriage now?" you finally ask.
"No sweetie" she replies. "Not open. If you are not 100% loyal and devoted to me -- I will leave you. No -- not an open marriage. A cuckold marriage. You understand the difference, don't you?"
"Yes -- I understand. And ... can I ask just one more thing? Can I ask ... who it is that you're going to spend this weekend with? Is it ... someone I know?"
Your wife smiles. "Yes sweetie, it is. All I'll say now is that it's one of your friends. An unmarried friend. A friend that, I think you know, has had a bit of a thing for me for a long time, and now ... he's going to have me."