If it's just a sex thing, I really wouldn't want to know. Because it's awkward. I'm just not that into head-porn involving my personal acquaintances.
A "lifestyle", on the other hand:
I'd worry about you if you were my friend. And, to be brutally frank, would arguably refer to your OH as "the controlling arsehole" in his and your absence. It's also, to be honest, a really weird dynamic to be around generally when one party is obviously subservient:
Years ago now, I attended a work friend' s house party along with a bunch of other colleagues and a few of the spouses. This one guy, Andy (not his actual name), brought his wife. I still haven't got the faintest idea what their deal was - but, eeeeeek, weirdest couple dynamic I've ever seen in real life:
Basically, Andy's wife would introduce herself as "Andy's wife" (no name of her own) - and Andy would comandeer her around the house all night long, telling her when and where to sit, when to get up, where to stand, ... you get the idea. Now, at the time I happened to be Andy's boss. And Andy was gunning hard for a promotion. Which resulted in him ordering the poor wife to basically personally wait on me. As in "wife, please go to the kitchen and fix Yeah another drink - then bring her coat. And maybe ask Jeremy if she can bum a smoke off him".
OP, I hope that's not what you're talking about. Because I don't think I've ever been so creeped out by a couple in my life. It was cringeworthy. I felt miserable for the wife all night long and with every passing minute became more steadfast in my conviction that my employee was an irredeemable arsehole.
Needless to say, in case you're wondering, this did not result in a promotion for Andy. He resigned a few months later and, oh boy, was I glad the creep no longer worked for me!
I honestly hope that's not the sort of thing you're talking about, OP. If it is, please consider keeping your personal dynamic out of social gatherings.