Sex is a Disease

http://en.wikipedia.org/wiki/Sexual_addiction

DSM-IV asserts that people who engage into sexual acts are mentally ill and should be sterilized, then treated with psychoactive drugs.

A few other ways to control population:
- contraception
- abstinence
- homosexualism
- abortion
- infanticide
- emigration
- decreasing immigration
- sterilization
- HIV/AIDS
- drug addiction
- euthanasia
- genocide