Im new here and set this account only to reply this topic. I have years of intense analysis over this and associated topics, what I think makes my response mandatory. I've tried cuckoldry few years ago and from that time also was mad, that it got bad and didn't continued.. Also this reply took 3 hours to write it down, so believe me, I'm positively involved in writing it
My english is just simple and can have mistakes, couse I still learn it, so please be understanding.
Hottobe cocked, english cuckG, ethnomasochist, jodaddyitsaboy, khrises4u made a point. Rest are just advices to go in the comment-writer choosen direction, some experience without think it over and also a propaganda. Sorry if someone had wrote it by his heart, but this topic is difficult and needs to be taken clearly without any exception. I won't be also nice, only clear in form, so please don't treat my words as an offence. In this moment, I cant reach such level of language skills.
My approach is that, everyones decisions are Their's responsibility and if They are aware, I really don't give a damn, who does what in His bed (or any other places). But, as an author of this post You showed me lack of understanding of emotions, mind mechanisms and took the topic apart of ******* nature of our species, what made me to write this all down.
Did You both ever considered a reason of cuckold fantasy of Your husband? Have He ever written down all the changes that this reason made in His mind, and way of His mind further developement? Have You written down all changes You made in Your mind to fulfill that fantasies? It can take years of research, but all of those "need to be written things" reveals desired conclusion. I know all the reasons of rise of this drive in me and You have to know, that they were coused by exterior negative influences. ALL OF THEM. With those influences mechanisms were changed to fulfill any male subconcious desire - to have an offsprinng anyway.
Lets dive with this approach... In normal conditions after adultery male leaves or dominates, in some extreme situations kills his female (and intruder dies sometimes too). Then (if she survives) rejects intruders offspring and thats normal for our species. There are ofcourse monkeys, that have group sex both ways, but this site and topic especially isn't about that.. All things that happens beside those two are compromises with influence on both minds, and cause of that, it needs to be considered throughly. If Your husband came out with this kink, it probably means, something in the past denied his natural manhood (His previous dominant approach to You, if it was unnatural from this strictly animalistic in act only, is also a sign of His attempt to regain it) and cuckoldry it's always about that - denial of someones genes, what in culture means manhood. For cuckold it goes with anger, guilt, shame, pain and other negative emotions, and through the (in this case distorted) mechanisms of regain Your womb, that all makes His wand stiff in the bed (as I have read, some hotwives here took intercourse away from their husbands, so they had to learn to replace it in any avaliable way, not healthy emotionally indeed...). If He had to deal with all of that negative emotions counciously, it would destroy You both, so with His agreement and aprovall they goes subconcious and when reapeted, they change Him as ewerything does in continuous situations. To stop it You will need to create opposite situations long enought, to be changed in a mind habbit. If He'll be keen to do this of course. The answer for You is question, as always in that cases. Will You accept Your "not quite conconcious till today" influence on Your husband with all it's consequences, find Yourself as a dominant female, where that direction leeds ALWAYS (whatever it's domination through adultery or any other things - there is a reason of including this sexual activity in SM set), or decide to encourage and help Your husband to be the man he could be, if that "reason of all" would not influenced him? Beeing a hotwife (sorry for all those, who saw it differently, especially males - with all my heart I'm with You) is all about hurting Your man subconcious, even if He conciously wanted it and told You, that it'll make Him happy. In that moment it was wrongly understood happines, that He also didn't realised or was accepted as a wrongly seen mixture to face His problem (that can be sexually driving as hell ofcourse, but not healthy for mind indeed).
I wrote only about the extreme directions, beacouse as I see, His approach to sex is "evolving" what means, he want's more and more. Probably, but not for sure, He'll wont accept mild kind of adultery, which also could be proposed as a mix to be learned, but first of all, his manhood have to be regain, or denied by You both. There may be specialist help needed too..
Also have to agree with Hottobe STRONLGY - now Your husband is less atractive to You, than BBC hotwife lifestyle, what means subconciously You've rejected him as a prior male and begin to use Him as a supply provider with awereness of common past, desires and still some dose of couple feelings that will slowly change into SM addiction. Your kind-a emotional relation with only one BBC also confirms that tendencies, and this road leads to UC only, if someone will not stop it before. Your womenhood downgraded Him and it's up to You, what You'll decide to do with it, if He's not present in this topic right now.
There can be also other reason - He always was a gay or bisexual and Your hotwiving was just an subconcius excuse to get closer to object of his desires. It's simple as that, but may be also true if You have in mind influence of society and family, which could reject him if he agreed with himself. Once again, travel into His brain is essential.
This is very difficult topic, if You both are willing to know the truth about Yourselve it can be more positive driving than cuckoldry can bring, especially, that our poscristianic and "submissive to wealthy and in power ones culture" teach Us all to deal with everyday pain, but almost never to focus only on happiness with healthy rejection of negative experiences (which is the case, when someone subconsiously brings troubles on himselves to deal with the main problem...).
Hope that it'll help You both.