I find the humiliation aspect a massive turn on but couldn't get into the caged / cream pie eating / physical abuse level. I suppose it's primarily the psychological humiliation I enjoy. I think the initial cuckold experience sets the tone & pattern for what follows. My wife's first bull was a guy she worked with, I'd lost my job so she got a job in a bar where she was frequently fucked by a black colleague. I was humiliated on 2 fronts here by a) being unable to support my wife & b) my wife openly having sex with a younger, stronger man. When he found out I knew he was fucking her he'd compound the humiliation by cumming on her face so I could see exactly what they'd been doing & being powerless & unwilling to stop it. This went on until she was fired from the job after fucking him in the bar in front of his friends.
Further humiliation came with her next stud who's her current bull. Things had improved & we were having work done on the house. The contractor was a young black guy & the obvious happened, I was barely out of the house the first day & he had his cock in my wife's mouth. The humiliation here was the fact that I was essentially paying this young guy to fuck my wife, which again I found both demeaning & great turn on. So much so that I still pay him to fuck her 3 years later to maintain the humiliation. This guy is an expert & knows exactly how the cuck humiliation works. I've never been allowed to watch them fucking, only to listen while he fucks her in our bed, however he often has me kneel & beg to be allowed to watch only for him to laugh & tell me to fuck off while he's slapping my wife's ass & feeling her tits humiliating me by doing whatever he likes to her. He invited us both to a party at his house where my wife & I served drinks to a group of his friends. She was soon stripped to her underwear & made to dance, his friends admired & groped her while I looked on helpless but horny. I was told to leave, I came back a few hours later & they threw her out of the house naked & cum-covered, collective, multiple humiliation !