Plenty of people on this board get off on the idea of another man fucking their wife right in front of them while they watch. And degradation is such a strange fetish?
Let me take the time to remind everyone that there are plenty of folks out there who get off on eating shit, puke, piss, vomit, etc. Plenty of people with rape fantasies, plenty with sexual obsessions about violence, death, corpses, etc. At least one serial child rapist who was allowed to operate for decades because child rape can be written off as silly horseplay if football is at stake.
Looking at the overall scope of fetishes, your degradation fantasies seem pretty tame. If you take the time to examine them and look for their root causes, you may learn something about yourself and possibly improve your relationship with your wife, but it all really isn't a very big deal.