Wouldn't do again, 3ways, 4ways etc with couples where one is joining because it was the others ideas, they tend to maybe start right then go wrong or go well until the day after when the other decided they didn't want to do it after all and regret it, but did it just because their otherhalf convinced them, that's not good and always awkward especially if you have stayed over, though sometimes you make a quick retreat and make an excuse not to stay.
Or there's the jealous one who perceives that one is getting more action or attention then them, even if that's not the case, again those are awkward in the morning or it can end suddenly if they decide to storm off, it may not help if they storm or and fun continues.
But those are not good 3sums, 4sums etc
Good ones are when all involved are active participants, and don't get easily jealous.