The difference is that you have all agreed to live with the double standard. For others, it can be a problem--and that issue has to be resolved for the relationship(s) to continue.
I wouldn't stay involved with any woman who said she wanted to have other partners but I couldn't. I find that completely unacceptable. I realize there are folks to whom that isn't a problem. The OP indicated discomfort with that sort of thing, so it's obviously an issue for her and needs to be resolved for that relationship to have a future.
And, no, describing what works for you isn't likely to piss anybody off. It hurts my little feelers not a bit that you've got a working relationship. Indeed, I'll buy a round of beer and help you celebrate it should you find yourself traveling near here.