What would happen, for instance, if suddenly, magically, men could menstruate and women could not?

The answer is clear - menstruation would become an enviable, boast-worthy, masculine event:

Men would brag about how long and how much.

Boys would mark the onset of menses, that longed-for proof of manhood, with religious ritual and stag parties.

Congress would fund a National Institute of Dysmenorrhea to help stamp out monthly discomforts.

Sanitary supplies would be federally funded and free. (Of course, some men would still pay for the prestige of commercial brands such as John Wayne Tampons, Muhammad Ali’s Rope-a-dope Pads, Joe Namath Jock Shields - “For Those Light Bachelor Days,” and Robert “Baretta” Blake Maxi-Pads.)

Military men, right-wing politicians, and religious fundamentalists would cite menstruation (“men-struation”) as proof that only men could serve in the Army (“you have to give blood to take blood”), occupy political office (“can women be aggressive without that steadfast cycle governed by the planet Mars?”), be priest and ministers (“how could a woman give her blood for our sins?”) or rabbis (“without the monthly loss of impurities, women remain unclean”).