When your wife is COMPLETELY addicted to the life of sleeping with Bulls, and you know that she would be bored out of her brain with just your cock - then that would be the time to ask her if you could watch her Bull grease her slopes with cum.
If she has only recently cuckolded you, she wil not want you to watch her as her Bulls teach her new sexual tricks in bed that you have never done to her YET.
A woman and her Bull have a special relationship, a full-on "zipless fuck", and they don't want to be a "circus sideshow" to preying eyes while they getting used to each other.
One of the risks for you is that if you do watch your woman fuck her Bull, then he might ask you to bend over and take his cock up your ass to cement his superiority over you. You might have to clean his car and drop money in his pocket each week to cover his expenses of dating your wife.................afterall, he is adding value to your marriage by giving your wife extra loving, which she obviously needs........and you can't supply.
Jealousy won't go away unless you go to Sex School and learn to be a more robust lover - but you can manage your jealousy by putting your wife on a pedestal and doing all you can to please her.
Instead of being jealous, discuss with your wife ways you can help her (around the home) and to feel andlook her best before she goes out with her Bull(s). Has she some nice new clothes that make her look as good as Cinderella at the Ball?