1741 Sex Ban

Summary
Due to a misinterpretation of a prophecy, the British Government believed 1741 to be a cursed year in which all children born that year would be abominations. Because of this, they banned sex and everything involved with it to prevent reproduction. It was found later that the year in question was actually 1741 BC.

Effects
The 1741 Sex Ban led to the creation of Porto Con, and an extreme increase in the pornography industry afterwards.