Any tips for getting wife's bull to not be such a jerk?.
Do not think there are any, If the guy feels like being a bad boy and ignoring you of treating you with distain he will, because that's in his nature.
My now wife has been getting picked up by black guys and fucked since before she was 15 years of age and was having long term relationships with them even before whilst we were dating.
You were saying" Her new boyfriend J absolutely REFUSES to wear condoms and has pretty much completely revoked my 'watching privileges'. Rachel is completely into this man so I didn't want to say anything to her."
All the time I have known my wife, her lovers have never used condoms, ( or I would be surprised if they even owned any, Europeans seem to have a different attitude to Americans over this, it has always been her responsibility for birth control, whether that was doing Anal during her fertile periods, BC Pills or a coil)
You also posted "The first bull (I'll call him 'D') started out great as he was our first (not her first black man, but the first since we started dating). He let me watch them have sex, was usually pretty courteous about asking for permission to take her on dates etc. for probably 3 months and then it suddenly went south. Apparently he just started to cum inside of her whenever he wanted. wouldn't even acknowledge me when he came into my house, and was just generally rude. What's worse is that Rachel never seemed to mind and always just tried to play it off saying he was just joking around."
He is going with your wife to fuck her, so that means cumming in her when ever he wants to he wants to, that is his prerogative, he is dating her not you!
If I had a dollar for everytime my wife's black boyfriends were openly rude and aggressive to me I would be a Millionaire and I certainly have never had my wife stand up to her lovers for them being rude or aggressive to me, in most situations when they are rude or aggressive to me in front of her, she will think it funny and laugh at his aggression towards me.
Her part of the sexual arrangement with them is to be available for them when they want her, if they passes her onto his friends to use, she knows that is part of the deal, as is pimping her out.
She has quite often over the years, come home from one of her lovers with a cut lip, black eye or some other bruise, (If I even thought of laying a finger on her she would have divorced me instantly), but the occasional slap from her black lovers is perfectly acceptable to her.
Yet she was happy to continue dating that particular guy or guys for many months after the incident.
The relationship in Europe between a White women and her black boyfriends is completely different to husband and wife and there are no common parallels.
We live in a city of 768,868 people and within a short distance we have clubs that catering for Nationals of Ethiopia, Chad, Liberia, Mali, Sierra Leone, Somalia, Réunion, Moroccan, Congo, Cameroon, Algeria, Senegal etc admittedly most are only open one night a week but it's the places where white women like my wife go to party and dance, it is very rare to see a black female there.