I wouldn't be surprised if, at some point, some technically ignorant legislator in some conservative backwater proposed a law requiring databases to have separate tables for men and women or something similarly brain-damaged.
If legislators in, say, Afghanistan or Alabama or somewhere hear about the inherently sinful architecture of unisex database tables, there may well be laws mandating certain types of brain damage in database architectures. Clueless alpha-males have done similar things in the past.
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To be fair, as one of the commenters points out, no data modeler would create Male and Female tables. So the early stages of this story could be a described as a "straw man" or pedagogical fiction. In fact the piece reads like a (rather good) data-modeling lesson. I once used the "friend-of" relationship as a teaching example. This marriage one is pretty good and I might use it one day.