And while birth seems like a separation, for us mammals it’s just a new form of attachment to our female parent. If your mother breast-fed you, as our species has done for nearly our entire existence, then you suckled from her all your water, protein, sugar, fats and even immune protection. She sampled your diseases by holding you close and kissing you, just as your father might have done; but unlike your father, she responded to your infections by making antibodies that she passed to you in breast milk.

I don’t dismiss the years I put in as a doting father, or my year at home as a house husband with two young kids. And I credit my own father as the more influential parent in my life. Fathers are of great benefit. But that is a far cry from “necessary and sufficient” for reproduction.

If a woman wants to have a baby without a man, she just needs to secure sperm (fresh or frozen) from a donor (living or dead). The only technology the self-impregnating woman needs is a straw or turkey baster, and the basic technique hasn’t changed much since Talmudic scholars debated the religious implications of insemination without sex in the fifth century. If all the men on earth died tonight, the species could continue on frozen sperm. If the women disappear, it’s extinction.

Ultimately the question is, does “mankind” really need men? With human cloning technology just around the corner and enough frozen sperm in the world to already populate many generations, perhaps we should perform a cost-benefit analysis.

It’s true that men have traditionally been the breadwinners. But women have been a majority of college graduates since the 1980s, and their numbers are growing. It’s also true that men have, on average, a bit more muscle mass than women. But in the age of ubiquitous weapons, the one with the better firepower (and knowledge of the law) triumphs.

Meanwhile women live longer, are healthier and are far less likely to commit a violent offense. If men were cars, who would buy the model that doesn’t last as long, is given to lethal incidents and ends up impounded more often?