Fornication

The word is often used in a biblical context, where its meaning is open to intepretation. The etymology of the English word leads to the Latin word fornix, meaning "an archway" or "vault" (a reference to a location in Rome where prostitutes could be solicited). Scripture also uses the word to refer to a more generic failure to follow the word of God.

The origin of the word leads to a common usuage to specifically mean "whoredom" rather than general extra-marital sex.