FORNICATION – ENGLISH “PROSTITUTION”
In case you don’t know what “prostitution” means:
The Youth Bible, Word Publishing, 1991, “Dictionary” p. 1373, “prostitute”:

Word Origins: An Exploration and History of Words and Language, Funk, 1950, pp. 258-259, “PROSTITUTE”:

Longman Dictionary of American English, 1997, p. 642:

The Random House Dictionary of the English Language (Unabridged), 1987, p. 1553, “prostitute | prostitution”:

Encarta World English Dictionary, 1999, pp. 1444-1445, “prostitute | prostitution”:

Microsoft Encarta Dictionary (paperback), 2002, p. 707, “prostitute”:

Roget’s II: The New Thesaurus, Expanded Edition, 1988, p. 384, “prostitute”:

P. 544, “whore”:
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The Three-in-One Bible Reference Companion, 1982, p. 556, “PROSTITUTE”:
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http://www.kslegislature.org/legsrv-statutes/getStatuteInfo.do, Kansas Legislature: Statutes, “Prostitution”:
21-3512. Prostitution. (a) Prostitution is performing for hire, or offering or agreeing to perform for hire where there is an exchange of value, any of the following acts:
(1) Sexual intercourse;
(2) sodomy; or
(3) manual or other bodily contact stimulation of the genitals of any person with the intent to arouse or gratify the sexual desires of the offender or another.
(b) Prostitution is a class B nonperson misdemeanor.
Merriam Webster’s Dictionary of Law, 1996, p. 393, “prosti…”:

What if one engages in indiscriminate sexual activity not for money? Is it still a crime? I don’t think so. But you can tell, some would like it to be.
The Merriam-Webster Dictionary: Home & Office Edition, 1998, p. 419, “prostitute”:

Webster’s New World Dictionary of the English Language: Concise Edition, 1959, p. 597, “prostitute”:

Oxford Dictionary of the Bible, Browning, 1996, p. 305, “prostitution”:

New Webster’s Dictionary of the English Language: Modern Desk Edition, 1976, p. 412, “prostitute”:

How about for the financial gain of marriage?
Funk & Wagnalls Standard Dictionary, 1993, p. 631, “prostitute”:

Collins COBUILD English Language Dictionary, 1988, p. 1154, “prostitute”:

Collins COBUILD English Language Dictionary, 1988, p. 1667, “whore | whorehouse”:

The Promptorium Parvulorum: The First English-Latin Dictionary, Mayhew, c. 1440 A.D.; re-typeset for the Early English Text Society, 1908; page column 44, “Bordel”:

Appendix C, p. 825, “Glossary of the Mediaeval Latinity of the Promptorium with Explanatory Notes | prostibulum” (prostitution):

A “bordel” is a brothel.
The World Book Dictionary, 1971, p. 1657:

Rawson’s Dictionary of Euphemisms and Other Doubletalk, 1995, p. 337, “prostitute”:

Some dictionaries say prostitution is just promiscuous sex leaving out money / gain:
Naturally, because of the character of the prostitution trade / crime some “newer” insulting and/or deviating slang / regional emanations / derivatives and/or synonyms are listed, not described. And, all of those denote occurrence in more recent times. (I’m surprised that the base Greek meaning of prostitution has held in so well. Apparently, it’s a lot easier to redefine words when transferring their meanings to our other and/or newer languages.) The English word “whore,” for example, predominantly means a “prostitute,” but a teenage girl might call another girl who she doesn’t like “a whore,” but that doesn’t mean that the receiving girl sells her sex for money: it usually means that she is just “easy”; or, in other words, “having sex without conditions,” which is actually the farthest thing from “selling” it.