Why Do We Still Insist on Marriage?

Sandra Tsing Loh wants to know, after bailing out on her husband of twenty years because she can do it all herself:

Sadly, and to my horror, I am divorcing. This was a 20-year partnership. My husband is a good man, though he did travel 20 weeks a year for work. I am a 47-year-old woman whose commitment to monogamy, at the very end, came unglued. This turn of events was a surprise. I don’t generally even enjoy men; I had an entirely manageable life and planned to go to my grave taking with me, as I do most nights to my bed, a glass of merlot and a good book ....

I can pick up our girls from school every day; I can feed them dinner and kiss their noses and tell them stories; I can take them to their doctor and dentist appointments; I can earn my half—sometimes more—of the money; I can pay the bills; I can refinance the house at the best possible interest rate; I can drive my husband to the airport; in his absence, I can sort his mail; I can be home to let the plumber in on Thursday between nine and three, and I can wait for the cable guy; I can make dinner conversation with any family member; I can ask friendly questions about anybody’s day; I can administer hugs as needed to children, adults, dogs, cats; I can empty the litter box; I can stir wet food into dry.

Which is to say I can work at a career and child care and joint homeownership and even platonic male-female friendship. However, in this cluttered forest of my 40s, what I cannot authentically reconjure is the ancient dream of brides, even with the Oprah fluffery of weekly “date nights,” when gauzy candlelight obscures the messy house, child talk is nixed and silky lingerie donned, so the two of you can look into each other’s eyes and feel that “spark” again. Do you see? Given my staggering working mother’s to-do list, I cannot take on yet another arduous home- and self-improvement project, that of rekindling our romance. Sobered by this failure as a mother—which is to say, my failure as a wife—I’ve since begun a journey of reading, thinking, and listening to what’s going on in other 21st-century American families. And along the way, I’ve begun to wonder, what with all the abject and swallowed misery: Why do we still insist on marriage? Sure, it made sense to agrarian families before 1900, when to farm the land, one needed two spouses, grandparents, and a raft of children. But now that we have white-collar work and washing machines, and our life expectancy has shot from 47 to 77, isn’t the idea of lifelong marriage obsolete?

Or, who needs men, first? But, also, why marry anyway?

Maybe Althouse has an answer for Sandra? Like love, maybe?

(Note: I skimmed the piece. If readers can find the passage where Loh admits she cheated on her husband cut and paste in it the comments...)