One other outcome: people will, unconsciously, start being a little more responsible about having illicit sex.
I fully expect the cases of venereal disease in all populations, except the sodomites, to decline as a result. Watch and see.
Agreed. And there is historical precedent. During the great depression birth rates declined a lot because people were too poor to raise babies. And there was no pill. And I've read that condoms felt horribly compared to today's. Last but not least, a lot of people had little education back then. Yet with all that working against them they figured out how to not make babies they couldn't afford (for the most part, and I've read that a lot of farming families kept making babies because they were self-reliant).
The main differences between then and now are abortion and welfare. Those catalysts have taught the population that there's no concern in making babies they can't raise. Maybe that is changing.