One part of my journey with the wife.
Our intimacy and marriage both got stronger and better. Because our bull introduced us to more kinky sex. my wife and I would suck black cock together. We were invited to interracial gang bangs where the husbands were used to suck the black men that were fucking their wives in front of them.
A good bull will enhance a marriage not try to destroy it. That is not what swinging or MMF's are about. It is about the benefit to everyone.
Avoid bad bulls that try to insert themselves between a couple instead of bringing a couple together for new kinds of intimacy.