Sweet RAD
The worldwide birthrate has plummeted to near zero. Women simply don't get pregnant. Occasional matings of men and women do work, but it is very hard to discern any pattern. Faced with this dire threat to human survival, some groups of people turn over their sexual lives to the control of a computer network. They wear a Reproductive Assistive Device (RAD) behind their left ear: a personality that is by turns compassionate, wise-ass, nagging, and a source of erotic fantasy.
Submissions from other authors are welcome. You'll have to read the original "Sweet RAD" story to get the bigger picture. I want to avoid stories of the computer network subverting the project for its own evil purposes.