I find it fascinating. A close friend of mine is married with 2 kids and both parties have boy/girlfriends. They are a strong couple and adore each other. Another friend of mine is in a open relationship were they can have sex with other people. They don't do it often but can.
I don't share well. Lol. I'm not a jealous person but it is not something I can do personally. Dave feels the same way.
The way I look at it is each to their own. As long as both parties are in agreement go for it.
Do you have the article link?
That is how I see it too. Everyone is into something different, be it gender or amount of partners or type of partners. And things get more complicated in situations like me and BeAu. I'm bi, he's not. So girls only. And since he couldn't be okay with me having sex alone with another guy, I'm not okay with him doing it with other girls, either. But he doesn't mind me sleeping with other girls alone. I just don't do it for the fair factor. But neither of us are opposed to another triad, either. But we wouldn't mutually date someone who wanted a fully poly lifestyle outside if us, either.
It is definitely an individual thing, totally dependent on whatever the people involved are comfortable with.
The article introduces the idea and how we should see more of it in video games that are RPGs, or not, or games you can, etc. It is a video game blog, so yeah. Lol.
http://kotaku.com/what-games-taught-me-about-having-two-girlfriends-at-on-1511252093