Autofellatioic Evolution of Humans
As the population grows over it's potential, the evolutionary process begins to take place. Humans will adapt to be able to perform autofellatio in order to reduce sexual desire. This will cause a dramatic drop in rates of sexual intercourse, allowing the human population to return to a more reasonable size that the one we cannot currently maintain.
The world is getting to large. Evolution must take place, as it did in other organisms. The way humans will adapt to influence a decline in a sizable population is the Autofellatioic Evolution of Humans.