Talk About Unintended Consequences

The New York Times had a really interesting article about how castrati--18th-century opera stars mutilated as boys to preserve their high voices--came into being because of a Vatican prohibition against women in church choirs. Obviously, Rome condemned this practice on behalf of the dignity of the body, but by then castrati had become entrenched in popular culture. I couldn't figure out what this reminded me of.

Then I remembered. It's the documented increase in abortion rates with diminshed access to birth control. What did they think, people would just stop wanting to hear high notes?