Adultery – Voluntary sexual intercourse between a mar­ried person and a partner other than the lawful spouse.
Chastity – Virginity, virtuous character, celibacy.
Celibacy – Abstinence from sexual intercourse, espe­cially by reason of religious vows.
Concupiscence – To covet or lust after. Unlawful or irregular desire of sexual pleasure. Lust, denotes evil desire, indwelling sin. The act of lust or desire springing from a diseased soul.
Defile – To make foul, dirty, or unclean; pollute; taint; debase. Sully, mar, or spoil, to corrupt the purity or perfection of, to violate the sanctity of, dishonor.
Fornication – Voluntary sexual intercourse between a man and woman who are not married to each other is a common type of fornication. Adultery is a type of fornication.

The Greek word for ‘fornication’ (porneia) could include any sexual sin committed after the betrothal contract. …In Biblical usage, ‘fornication’ can mean any sexual congress outside monogamous marriage. It thus includes not only premarital sex, but also adultery, homosexual acts, incest, remarriage after un-Biblical divorce, and sexual acts with animals, all of which are explicitly forbidden in the law as given through Moses (Leviticus 20:10-21). Christ expanded the prohibition against adultery to include even sexual lusting (Matthew 5:28).

Any sex outside marriage. Voluntary sexual intercourse outside marriage, voluntary sexual intercourse between two persons of the opposite sex, where one is or both are unmarried, Bible sexual immorality in general, especially adultery. Sexual intercourse between partners who are not married to each other.

Word History: The word fornication had a lowly beginning suitable to what has long been the low moral status of the act to which it refers. The Latin word fornix, from which fornicti, the ancestor of fornication, is derived, meant “a vault, an arch.” The term also referred to a vaulted cellar or similar place where prostitutes plied their trade. This sense of fornix in Late Latin yielded the verb fornicar, “to commit fornication,” from which is derived fornicti, “whoredom, fornication.” Our word is first recorded in Middle English about 1303.

Pederasty – Sexual activity involving a man and a boy, especially anal intercourse.
Pure – Clean and not harmful in any way, free from anything different, inferior, or contaminated; wholesome, virgin or chaste. Without any extraneous and unnecessary elements. Untainted by immorality, espe­cially that of a sexual nature. Classical Latin putare, to cleanse, Old High German fowen, to sift.
Sodomite – A person who has anal sex with another person (especially a male who engages in anal copula­tion with another male).
Sodomy – Any sexual contact that is not penile vagina. Anal, oral or other copulation with a member of the same sex, anal or oral copulation with a member of the opposite sex, bestiality.
Undefiled – Pure, uncorrupted, immaculate, not made dirty, free from contamination, kept clean and honor­able.
Virtue – Moral excellence and righteousness; goodness, an example or kind of moral excellence: the virtue of patience, chastity, especially in a woman, a particularly efficacious, good, or beneficial quality; advantage: a plan with the virtue of being practical, effective force or power.