Legal moralism is the theory of jurisprudence and the philosophy of law which holds that laws may be used to prohibit or require behavior based on whether or not society's collective moral judgment is that it is immoral or moral. Legal moralism implies that it is permissible for the state to use its coercive power to enforce society's collective morality.
See also 
Further reading 
- Morality, Justice, and Judicial Moralism: An extensive discussion of the topic, including helpful tables.
- Philosophy of Law (Internet Encyclopedia of Philosophy): Entry includes a short section about Legal Moralism.
- "Liberty-Limiting" Principles: Essay by Dr. Francis R. Guth.