It is not a personal decision if you have a relationship, because it requires all people into that "Open" relationship to agree on the terms.
The only actual "benefit" I see from such an "Open" relationship is to have sex more frequently, at the cost of having to make time for your lovers. You could use that time with your main partner... but hey! Your partner can also engage with others... and if for some reason one /"Open" relationship ends, you always have another partner available. Pretty interesting...
Why are you into a relationship if you prefer to spend your time having intimacy with others?
You say society should not care about your personal decisions. Maybe you should meditate and think on the odd cases, what are the risks and what problems will your behavior generate? Can you at least try to think about for a second?