O.K. Let's see how much more trouble I can get into here ...
The "institution" of Monogamy, and Marriage, was/is regarding offspring, family lineage, and the "right" to property/wealth/influence/power. Therefore, SEX, which generally leads to offspring, was guarded/horded/protected, and "locked away" with all the other family valuables. That WAS the only way it (procreation) could be "controlled". But, that was THEN, and this is NOW.
I know married str8 couples in open relationships. As long as there isn't any "extraneous" procreation, or undue/strong emotional attachments, everyone is free to explore their own sexuality as long as they're not "sneaking around"/"cheating". It's the "sneaking" that's the "cheating".
The core concern in those relationships is not Sexual "Fidelity", but, rather, Honesty, Respect, and complete Acceptance of who, and what, each other truly are.
SO ... that said, and taking it (absurdly) a step further, since Nudity (especially in The States) is equated with Sexuality, does that mean that a Gay Guy, in a committed relationship, shouldn't be allowed to change or shower at the gym anymore?
Yes, sex is a major concern, and is only enhanced when it Means something. However, it can also be nothing "more" than an activity/sport, not unlike taking a walk, or having lunch, with someone.
I am "protective" of my partner's body and health. That also includes his mental health and happiness. So, as long as he plays Safe, if he runs across an opportunity to have some "Fun", and he's open and honest about it, whether he wishes to include me, or not, I fully support his options to explore.
I guess you could say that I cherish his Heart far more than I'd declare "ownership" of his dick! And, that being said, you'd likely be surprised just how often Nothing happens! Not because he "Can't"/is not allowed, but rather because he doesn't wish to. And, THAT means more than almost anything else.
I'm not declaring that this will/should work for everyone. I'm just trying to explain what works for us.
Keep smilin'!!


Chaz