What's the appeal of cuckold fetishism?

I'm not sure if its new. Or perhaps its something that was popular during similar times in history. When you have a culture that is so powerful that they feel nothing will happen. When they try to be so open to new cultures that they abandon their own. (Kinda thinking of the Romans)

Because I certainly don't understand it. I'm loyal to a fault. There is no fucking way I would be cool with that dynamic in my relationship with my wife. I personally cannot relate. But there are a lot of fetishes I don't relate to. So I try not to judge.

At the same time, I can safely say. Not my cup of tea at all. You married me. You fuck me. You ONLY fuck me. Thats what we agreed on. I cannot put myself in the position of being a cuck. Of cucking someone else. Does not compute in my mind.

I honestly don't understand how someone gets turned on by it.

But I also don't get turned on by feet. So who the fuck am I to judge?

Well, people are fascinated by humiliation. A load of BDSM is humiliation of one way or other. This is just logical extension of the existing fetish.

For the cuck, it's the whole concept of being humliated. A husband is expected to have sexual dominion over his wife, and allowing another man to come in and fuck her is a breach of this power that he is supposed to have. The cuck could also be gay or bisexual, and inviting another man in his bedroom could be a way to get close to a man sexually in a "safe space" of sorts.

For the wife, being rebellious in the sense of not adhering to the unspoken rule of "hubby has sexual dominion over me", is mentally stimulating.

For the bull, taking away another man's sexual power and getting something out of it (I.e. fucking the wife), is basically a win-win. It's sexual bullying with rewards. The bull is top dog in this triad of adults, and that type of title does well in padding the ego.

some (a lot) of people are often attracted to one of their earlier/younger encounters. Kinda like chasing the dragon.. You can't catch it, even if you push for the extreme of your most emotional encounters, whether good or bad. Someone always had top get picked last.