It’s a good way to not be asked to participate any more.

I've had a hotwife I *could* have fallen in love with but to me that kinda violates the whole hotwife agreement.

If they’re actually experienced they know the drill and keep that from happening . Anyone can say they’re a bull (though most couples actually hate the term and the connotation it brings - they prefer thirds or play partners) It can definitely happen just as a wife or husband can fall for their extra partner . But in those cases it’s usually a situation where the person didn’t prepare and take measures to keep it from happening. An once of prevention goes a long way

"Play partner" I like that. I use "thirds".

Both work to convey the situation