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 masturbation, sodomy and bestiality.
== History and terminology ==
For much of modern history, a "crime against nature" was understood by courts to be synonymous to "buggery", and to include anal sex (copulation per anum) and bestiality. Early court decisions agreed that fellatio (copulation per...