In my opinion, a good bull, knows the boundaries, may push them slightly, but very aware of them. He MUST be reliable, honest, ideally well endowed, fit, sexually assertive, flirtatious, confident, a cute smile, understand cuckolding and what the cuckold and hotwife need to take away from each experience. Appreciate that the cuckold wants to watch/ be involved/ used as well, and know just the right amount of that as well. Know that my cuck and I, are a normal couple, with jobs, mortgages, family's etc. so don't try to get involved in my life more than a sexual friendship. Finally, respect me, I enjoy sex with other men, I like being 'slutty' and I like how that evolves in the bedroom, but i'm not your whore, i'm temporarily on loan, as your body/cock is.
Also, my husbands reasons for living this way are mostly psychological but also anatomical, he was 'blessed' with a tiny penis, that has caused him a lot of pain, humiliation, anguish, frustration and grief over his life, so also be aware that a wonderful man is sharing his wife for those reasons, even if he is bi, submissive, sissified etc. that should also be also still be done with respect.
BTW this is not directly at you BBCnATX, just answering your question from my perspective to all bulls, of what we want and seek.