Eve, the first woman (implicitly a virgin) on earth, is referenced as an example of a natural and pure woman, having an acceptable marriage with the male Adam through coitus, meeting the purity requirements of both the new and old covenants. She did not have an ervat davar (uncleanness), defilement or reason to be divorced. When she married Adam, through having sex and uniting physically and spiritually, her intellect and mentality changed, she obtained and possessed a one-male cognizance. Of course, the male who became intimate with her was Adam, the only other human being on earth. Intellectually, he became more than co-existent, he became one with her. They were a clean and undefiled, marital entity, a united body, each became part of the other, one flesh (Gn. 2:24), and they fulfilled the marriage institution, social and psychological adherence and oneness commandment: “Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh”.

The Old Testament fortified this female virginity (zero male cognizance factor) and purity concept with law (biblical revelation). The natural (physical) and the spiritual (biblical) attest to the essence of marriage. However, the parent of a daughter, due to the circumstances, was given authority to approve or negate marriage. Regardless, the daughter was obligated to chastity either through life time marriage, or singleness (damage control) through the parent's decision. Unfaithful women, who attempted to deceive and work around chastity law, were judged as criminals to be executed with capital punishment.

As to male sexual enlightenment, Adam discovered and was awakened to Eve's purity, he “knew” her, experiencing her and a marriage bond physically and spiritually from virginity to a chaste wife, having a one-female cognizance. This is part of acceptable marriage, discovering the virginity and purity of a woman: natural revelation. During the old covenant, the male was eventually allowed several wives, having a two-or-more female cognizance (polygamy). However, this stopped and monogamy was restored in the new covenant.

Eventually, as time progressed and further laws of the old testament were made, due to the hardness of the Hebrew people's hearts, remarriages (with women of more than a one-male cognizance factor) became acceptable according to the law of Moses (the second law, the redaction). Nevertheless, the Lord Jesus Christ reproved part (Dt. 24: 1-3) of the second law of Moses, and remarriage (such as that of Hosea and Gomer) was no longer tolerated in the new covenant. Furthermore, the defilement abomination and non-return law (Dt. 24: 4) has never changed. The former female purity and chastity standard was renewed, and also established marriage for chaste widows, who were allowed to marry (being no longer married to a dead man, the widow's cognizance of a deceased husband did not impute liability upon her). The new covenant is a better covenant than the old testament: it is a fulfilling covenant, wherein God's desire for perfection of his people is apprehended.

Links:

Define Fornication

Curse of Unlearned Prophets and Teachers

Avoid Spiritual Fornication and UnGodly Desire

Male's Obligation: Parental Chastity Guarantee

Fornication Recovery and Sexual Abstinence

Absolving a Defiled Marriage

Wastefulness of Onan

Ervah

One-male Cognizance Factor

Mimi Alford: Deliberating Fornication

Eternal Security

Defilement and Marriage Deception

One-party Defilement: Masturbation
(A lustful act and non-continuous sin which does require confession and repentance, but not marital abstinence, divorce or marriage)

Dreams and Warnings: Don't Marry Out of God's Will

Guideline for the Single