It's Been Done

Instapundit reports on a movement to require that marriages be for the purpose of procreation and that infertile marriages be declared invalid.

According to Jewish tradition, infertility is grounds for permitting divorce and even, according to some authorities, grounds for requiring divorce. (I think that last is going a little too far.)

Addendum: John J. Reilly takes this more seriously than the originators did:

The interesting thing about this initiative is that we are in the last few years when it will immediately be perceived as a joke. There are below-replacement-level birthrate societies in Europe and East Asia, and even some depopulating states in the United States, that really should be considering pro-natalist schemes at least this radical, if not this stupid. It's a good bet that they soon will.