Fornication
Part of speech: noun
Definition: sexual intercourse, especially on the part of an unmarried person. The act of such illicit sexual intercourse between a man and a woman which does not by law amount to adultery.
Adultery
Part of speech: noun
Definition: Sexual intercourse by a married person with someone other than their spouse.
Example sentence: I do not believe we can blame genetics for adultery, homosexuality, dishonesty and other character flaws.