What is "crime against nature"

n. (context legal English) Any of various sexual deviations that, at one time or another, have been considered to be so unnatural as to be illegal

The crime against nature or unnatural act has historically been a legal term in English-speaking states identifying forms of sexual behavior not considered natural or decent and are legally punishable offenses. Sexual practices that have historically been considered to be "crimes against nature" include anal sex and bestiality.

Crime(s) against nature may refer to:

• Crime against nature, a form of sexual behavior that is not considered natural and is seen as a punishable offense in some jurisdictions
• Crimes against nature that are animal abuse
• Crimes against nature that are considered to be damaging to the natural environment
• Crimes against nature, certain medical/ scientific experiments and developments such as cloning
• "Crimes Against Nature", the title of a letter by Robert F. Kennedy Jr. published in the December 11, 2003 issue of Rolling Stone magazine
• Crimes Against Nature (book), a political book by Robert F. Kennedy, Jr.