This is very dangerous for the world. If anyone should be allowed to marry as many people as they want there would be a lot of society anomalies.
Also, due to the fact that sexual activity is something that transfers a lot of diseases it may create pandemia or something that would infect the global population.
Are you not confusing promiscuity with polygamy? The whole point of marriage is so they don't go to other partners, and precisely avoid what you describe. Else they wouldn't bother with marriage at all.
Well as long as it's consensual, I think it's okay. Though that's just to live under the same roof. Of course, when it comes to the Christian doctrine, they're only allowed one wife. If you're going to strictly follow that, then of course, the answer is no. And most laws also don't find it acceptable. It would be between the parties involved if they can stomach the fact that they're sharing their wives/ husbands with other people.
