unnatural sin:

Religious and mopralistic term for:

1. Any sexual practice considered sinful and immoral because it is performed by people who are not married to each other, because it does not lead to procreation, or because it deviates from a pattern set by the mores of the times.
SYNONYMS: unnatural-act ; unnatural-sex .

2. Any sexual practice banned by law such as sodomy and necrophilia.
SYNONYMS: abominable-crime-against-nature ; detestable-crime-against-nature .

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