permission

My wife and I are in our mid 30s I'm English and she's Vietnamese, we live in Hanoi. We have a pretty good sex life but it could be spicier let's say. She's a bit prudish and gets embarrassed when I suggest freaky stuff (but she does like to be dominated strongly now and again). Anyway, she...

Have any other Bulls placed a precondition on the couple that you are dominating, such as: 1. The husband is not allowed to fuck his wife at all without your permission; or 2. The husband may ONLY fuck his wife if you fuck him at the same time?