While I recognize there are disadvantages as well, now that I have seven children, I keep finding advantages to plural marriage, especially in specific every day situations. My wife and I discuss them and laugh about it, but jointly acknowledge their merit.
Example 1: Right now, my wife is very ill with a sinus infection. Two of our children are home schooled, and three are still too young for school. I have a vacation blackout at work because it is Open Enrollment for more than 12,000 o