Sexual Immorality as Defined by Scripture: The Biblical Sins of Flesh

Note: This is by far the driest, most straight-forward, least entertaining article I have ever written. I wrote this out of necessity, more as a textbook than an interesting read. I know most readers will not read every section, so feel free to search for the topic you came to find. I would also like to note that this is by no means an exhaustive list of every sexual act which is forbidden by Christian and Jewish scripture. I chose to focus on the main, more clear-cut issues for now.

Let’s dive into the heart of the matter. This article explores key issues often regarded as sexual immorality within scriptural contexts— Click on each subject to jump to that section in the article:

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We'll unpack these in detail, along with a few additional topics towards the end. This is the “list” many seek when questioning what constitutes sexual immorality according to biblical scriptures.

Navigating the complex landscape of sexual morality can be challenging, especially when seeking clear, scripturally-backed answers. As marriage counselors, we've frequently encountered confusion among Christians regarding what constitutes "sexual immorality." Our experience, combined with countless queries on forums, underscores the need for a well-defined, accessible exploration of this topic. This article aims to demystify the Biblical sins of the flesh, presenting ten specific acts identified within scripture as immoral. By unpacking these teachings, we hope to provide clarity and support to those striving to uphold their spiritual and moral values.

Before we delve into the list of what constitutes sexual immorality according to scripture, it's essential to understand why clear answers to this question are elusive. The simplest reason is that the Bible never explicitly defines "sexual immorality," despite numerous references to it in various forms. The absence of a precise definition likely stems from the assumption that the concept was clearly understood by its original audience. Just as a modern writer on sports wouldn't need to define what constitutes a sport, ancient texts didn't specify what was considered sexually immoral because it was commonly accepted knowledge—from the era of Moses to that of Christ. It is only in more recent times that behaviors like homosexuality, prostitution, incest, or pedophilia have been explicitly categorized as "immoral."

To ensure a comprehensive biblical and historical understanding, we consult ancient Jewish texts, including the Tanakh—commonly known as the Old Testament—along with the Mishnah, Talmud, Midrash, and other writings. While these texts, except for the Tanakh, are not deemed canonical, they offer valuable insights into the beliefs of Jewish leaders and scholars and give us a glimpse into life around the time of Christ. These sources provide a broader view of societal norms regarding morality at that time, which is crucial for our discussion. The controversy surrounding the use of these texts in modern Christian contexts is a debate for another article; here, we focus on their historical value in shaping our understanding of what was considered moral or immoral.

Adultery

Adultery

Adultery, from a biblical perspective, is considered a severe violation of the marital covenant between a husband and wife. In the Ten Commandments, it is explicitly forbidden: "Thou shalt not commit adultery" (Exodus 20:14). This law underscores the importance of faithfulness and the sanctity of the marriage bond. In Jewish texts, adultery is not only a sin against one's spouse but also an offense against God and societal order. The Talmud further explores the implications of adultery, indicating severe consequences for those involved (Sotah 26b). Historically, adultery encompassed a broader range of forbidden sexual relationships, not just with another man's wife but also other relationships deemed inappropriate. The prophetic writings often use the metaphor of adultery to describe unfaithfulness to God, illustrating its spiritual ramifications as well (Hosea 2:2-5). Overall, the biblical and Jewish perspective on adultery highlights its impact on individual integrity, family stability, and communal harmony, advocating for a moral framework that respects and upholds the marriage covenant.

 

Incest

 

In the biblical context, incest is explicitly forbidden through a detailed list of prohibited familial relationships laid out in Leviticus chapters 18 and 20. These laws define incest to include sexual relations between close relatives such as parents, children, siblings (including half-siblings), and certain in-laws like a father's wife or a brother's wife. Additionally, sexual relations with aunts, uncles, nieces, and nephews are also considered incestuous. The prohibitions are framed not only as moral directives but also as means to maintain the sanctity and health of the family unit. Leviticus 18:6 states, "None of you shall approach any one of his close relatives to uncover nakedness. I am the Lord." This passage emphasizes that such acts are viewed as a profanation of family integrity and holiness. Rabbinic literature, such as the Talmud, further interprets these laws, discussing the degrees of kinship and the severity of transgressions in cases of incest. This meticulous detailing in both Biblical and rabbinic texts underscores the seriousness with which incest is regarded in Jewish law and ethics.

 

Homosexuality

From a Biblical perspective, the prohibition of homosexuality is explicit and thorough, reflecting deep cultural and religious norms of ancient societies. Leviticus 18:22 and 20:13 explicitly forbid male homosexual acts, describing them as abominations. The emphasis here is on the behavior rather than orientation, underscoring a moral boundary set by divine command. *Note on Leviticus 18:22 below. The New Testament echoes this sentiment in several passages. For instance, Romans 1:26-27 discusses men and women exchanging natural relations for unnatural ones, labeling these relations as contrary to God's will. Similarly, 1 Corinthians 6:9-10 lists those who engage in homosexual acts among those who will not inherit the kingdom of God, reinforcing the sin's severity.

The Talmud interprets these prohibitions to mean that any sexual acts between males, including romantic contact, are under the ban of homosexuality. Texts like Sanhedrin 54a articulate the age of accountability and extend discussions to scenarios less explicitly covered in the Torah. Maimonides in Mishneh Torah codifies laws against homosexual acts and, interestingly, extends discussions to lesbianism based on a broader prohibition against following the practices of Egyptians and Canaanites (Sifra 9:8). Sifra also mentioned the sins of the Egyptians, stating: “What did they do? A man would marry a man, and a woman, a woman.” This is a clear indication that relations between women were viewed the same as relations between men.

Temptation versus action is a significant theme. Jewish and Christian teachings differentiate between feeling tempted by same-sex attraction and engaging in homosexual acts. The latter is considered sinful, emphasizing free will and the ethical responsibility to resist such temptations. This extended discourse shows how deeply these ancient texts delve into the complexities of human behavior, setting stringent boundaries aligned with their view of a divinely ordained moral order.

Leviticus 18:22: The translation of Leviticus 18:22 has faced challenges from those who claim it was altered in modern times to specifically condemn homosexuality, a claim popularized within some LGBTQ communities. Critics argue that the term "homosexuality" was inaccurately inserted into Bible translations only after 1946, suggesting the original scripture did not condemn these relationships. However, the original Hebrew text uses clear language with the word "zakar" (man) to denote male individuals, providing no historical basis to suggest a mistranslation or change in interpretation. The verse explicitly states that a man should not lie with another man as he does with a woman, indicating that the prohibition of male homosexual acts has been consistently understood and translated across centuries of biblical scholarship.

 

Bestiality

Bestiality, the act of engaging in sexual relations with animals, is unequivocally condemned in the Bible and further explained in rabbinic literature. The primary biblical references are found in Leviticus. Leviticus 18:23 clearly prohibits this behavior, stating, "And you shall not lie with any beast and defile yourself with it, nor shall any woman give herself to a beast to lie with it: it is a perversion." Similarly, Leviticus 20:15-16 prescribes severe consequences for both men and women who commit such acts, mandating death for both the human and the animal involved. In Jewish texts, the severity of bestiality is emphasized by its categorization as a violation of divine commandments. The Talmud, for instance, includes discussions on the implications of these acts and reiterates their prohibition (e.g., Sanhedrin 56a, which lists bestiality among the forbidden relationships for Gentiles under the Noahide Laws). Such prohibitions are viewed not merely as legal boundaries but as essential to maintaining the spiritual and moral fabric of the community, illustrating a profound commitment to separating humans from animalistic behaviors and preserving human dignity.

 

Prostitution

Prostitution is addressed explicitly within biblical texts, with strong condemnations in both the Old and New Testaments, as well as in rabbinic literature. In the Bible, Deuteronomy 23:17-18 prohibits both male and female prostitution, stating, "There shall be no whore of the daughters of Israel, nor a sodomite of the sons of Israel. Thou shalt not bring the hire of a whore, or the price of a dog, into the house of the LORD thy God for any vow: for even both these are abomination unto the LORD thy God." This passage makes clear that earning money through prostitution and using such earnings in religious offerings are equally detested. The term "sodomite" in historical translations generally refers to male prostitutes, especially those involved in cultic rituals. The condemnation extends to both participants—the prostitute and the client—emphasizing a broader societal and spiritual corruption. Rabbinic literature, including the Talmud and Midrash, often discusses the social implications of prostitution, emphasizing its destructiveness to both individual morality and communal holiness. Prostitution is seen not just as a sexual immorality but as a perversion that undermines the sanctity of the marital relationship and disrupts social order.

 

Rape

 

From a biblical perspective, while the term "rape" does not appear specifically as a named sin, its prohibition and moral implications are clearly delineated in various scriptures and rabbinic interpretations. Biblically, rape is treated as a grave offense, encompassing elements of theft, violence, and adultery, particularly when the victim is betrothed or married. Deuteronomy 22:25-27 draws a distinction between consensual and non-consensual acts, highlighting severe consequences for the perpetrator in cases of rape. This passage underlines the crime akin to murder, emphasizing the violation of the victim's autonomy and sanctity. The Talmud (Ketubot 39a) elaborates further, categorizing rape as a severe violation that impacts both the victim and the community. It emphasizes the social and ethical responsibilities to protect individuals from such violent acts. Jewish law also addresses the compensation and punishment aspects, indicating the seriousness with which such offenses were regarded historically. Through these texts, the act of rape is implicitly linked with broader categories of moral and legal infractions, illustrating its complexity within the fabric of biblical law and ethics.

 

Lust

 

In the biblical perspective, lust is considered a significant sin, not merely for its potential to lead to physical acts of immorality but because it represents a corruption of the heart and mind. Jesus amplifies this in Matthew 5:28 by stating, "But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart." This underscores the seriousness of lust as akin to the physical act of adultery, highlighting the importance of purity in thought. The Jewish texts also address this issue, emphasizing the importance of guarding one's thoughts. The Talmud (Kiddushin 40a) discusses the concept that thoughts of sin are sometimes considered more severe than the sin itself, particularly when it comes to sexual immorality. This is due to the pervasive and corrupting nature of lustful thoughts that can dominate a person's mind and distance them from spiritual goals. Both Christian and Jewish teachings converge on the principle that controlling one’s desires is crucial, not only to prevent the physical acts of sin but to maintain spiritual purity and integrity. This is reflected in numerous admonitions throughout Proverbs and Psalms which caution against the dangers of wayward desires and the importance of a disciplined heart.

It's essential to distinguish between temptation and lust, as these are not synonymous in biblical teachings. Temptation is the mere presence of thoughts or opportunities that could lead to sin, which in itself is not sinful. It is a common human experience and an opportunity for spiritual growth. Lust, however, is the deliberate and willful indulgence in illicit sexual thoughts. It involves allowing oneself to entertain and nurture these thoughts, which according to scripture, equates to committing the sin internally. This distinction underlines that while everyone faces temptations, succumbing to them and allowing them to turn into lustful thoughts is where sin begins. This perspective helps believers understand the importance of controlling not only their actions but also their thoughts to maintain spiritual integrity.

 

Fornication

 

Fornication, often referred to as "sexual immorality" in scripture, encompasses any sexual activity outside the sanctity of marriage. In the biblical context, as seen in passages like 1 Corinthians 6:18-20 and Hebrews 13:4, Paul instructs believers to flee from sexual immorality, noting that sins committed sexually are against one's own body and that God will judge the sexually immoral. Jewish teachings, explored in texts such as the Talmud and Mishnah, also emphasize sexual purity, advocating that sexual relations should conform to the ethical and religious standards set by the Torah, and should only occur within the bounds of marriage to preserve familial integrity and personal sanctity. Both traditions emphasize the importance of confining sexual relations to marriage, aligning with divine intentions for human intimacy.

In biblical times, marriage was primarily a covenant, more relational than contractual, and deeply rooted in religious and cultural practices. It was established through agreements between families and cemented by public declaration and consummation, rather than through written documents. Today, while marriage often includes legal documentation, its essence as a covenant remains significant in religious contexts. The Bible views marriage as a sacred union, a commitment before God to form a lifelong partnership, reflecting a deep spiritual and personal bond. This covenant required that a man agree to care for and provide for a woman throughout her entire life before sexual relations could take place, emphasizing the lifelong commitment and responsibility involved.

 

Divorce

 

Divorce and remarriage are topics of significant weight and complexity in Biblical teachings, framed within the context of a sacred covenant that mirrors God's enduring commitment to His people. The Bible emphasizes that marriage is not merely a legal agreement but a covenant made before God, designed to last a lifetime. This ideal is illustrated in various scriptural passages, such as Genesis 2:24 and Ephesians 5:25-27, highlighting the profound unity and sanctity of the marital bond.

The Scriptures provide specific situations where divorce is permitted, notably in cases of marital unfaithfulness (Matthew 19:9) and abandonment by an unbelieving spouse (1 Corinthians 7:15). Jewish texts, such as the Talmud, expound upon these scenarios, offering deeper insight into the social and religious implications of these allowances. The decision to divorce is never taken lightly, reflecting the seriousness with which the marital covenant is regarded.

In line with the gravity of divorce, the conditions under which remarriage is allowed are also carefully delineated. The Bible permits remarriage primarily in cases where the marriage covenant has been fundamentally broken through sexual immorality or complete desertion. Remarriage after divorce for any other reason is often viewed with caution, reflecting a commitment to the sanctity and permanence of the initial marital union.

Rabbinic literature provides additional guidance on the issue of remarriage, illustrating a historical understanding and application of Biblical principles. The Talmud and other texts discuss various scenarios and their impact on the community and individual spiritual lives, offering a broader cultural context to the scriptural directives.

Despite the allowances for divorce and remarriage, the overarching theme within both Christian and Jewish teachings is reconciliation. Scriptural passages encourage forgiveness and restoration over separation, with numerous examples of God’s mercy and forgiveness serving as a model for marital reconciliation. The story of Hosea and Gomer, for instance, is a powerful testament to the possibility of forgiveness and renewal within the bonds of marriage.

 

Pedophilia

 

The Bible does not directly address pedophilia in the modern sense of the term, but it establishes principles regarding the protection and sanctity of children. For instance, in Matthew 18:6, Jesus speaks of the severe consequences for anyone who would harm or "cause to stumble" one of the little ones who believe in Him, implying a moral directive against exploiting or harming children. Jewish texts, particularly the Talmud, also emphasize the protection of children. The concept of protecting minors is integral, and sexual relations with a child are viewed under the umbrella of severe exploitation and sin. The Talmud explicitly forbids sexual relations with a girl until she is capable of childbearing, defined typically by the age of twelve and a half (Niddah 44b). This establishes a clear framework that sexual activity involving children is morally and legally reprehensible, reflecting a broader biblical principle of protecting the vulnerable and maintaining purity in one's actions.

The understanding of the age at which an individual is considered mature enough for sexual relations has evolved throughout the centuries, influenced by factors such as life expectancy, cultural norms, and education levels. Historically, the minimum age for such relations was often linked to physical signs of puberty, reflecting a readiness for childbearing as per the Talmudic stipulation of twelve and a half years for girls (Niddah 44b). However, it was never acceptable in biblical or Talmudic times to engage in sexual relations with a prepubescent child. In contemporary society, the definition of an adult and the age of consensual consent have been redefined to align with modern understandings of psychological and emotional maturity. These changes acknowledge the increased life expectancy and the extended period of education and development that characterize modern life. This shift ensures protection and responsible engagement in sexual activities, adhering to both legal and ethical standards that recognize the full development of an individual.

 

Other Forms of Sexual Immorality: Gray Areas

 

Masturbation

The Bible does not explicitly mention masturbation, and there is no direct prohibition against it in the canonical texts. However, some interpretations of biblical teachings, particularly from stories such as that of Onan in Genesis 38, have historically been used to infer a negative view on the practice. Jewish sources, especially within Talmudic discussions, also do not directly address masturbation, focusing more broadly on the issues related to wasting seed, which has been debated among scholars for its implications on masturbation. These interpretations vary widely among different theological and rabbinic authorities, reflecting a spectrum of views rather than a unanimous stance.

Menstruation

The biblical stance on sexual relations during menstruation is outlined in Leviticus 15:19-24 and 18:19, where it is considered a matter that renders both individuals "unclean" rather than explicitly sinful. This unclean status requires specific rituals of purification. The concept is further expanded in Jewish law, particularly in the Talmud, which strictly prohibits sexual relations during this period, aligning it with norms of ritual purity rather than moral wrongdoing. The focus is more on ceremonial cleanliness and respecting the laws of niddah (separation during menstruation) within Jewish practice.

Polygamy

The biblical stance on polygamy acknowledges its practice among key figures without explicitly endorsing or condemning it. In the Old Testament, figures like Abraham, Jacob, David, and Solomon had multiple wives, reflecting social and economic norms of their times (Genesis 16:1-4, 29:20-30; 2 Samuel 3:2-5; 1 Kings 11:1-3). However, the narrative sometimes reveals the familial strife and complications arising from polygamous unions. In Jewish law, polygamy was practiced until around the 11th century when Rabbi Gershom ben Judah issued a decree against it, reflecting a shift towards monogamy influenced by surrounding cultures and internal ethical debates.

Conclusion

In our journey through the landscape of sexual immorality as defined by scripture, we've explored the profound wisdom found in both biblical and Jewish texts. These ancient teachings offer a clear, unwavering framework for modern believers striving to align their lives with spiritual and moral values. We've examined ten specific acts identified within scripture as immoral, providing a detailed understanding of why these behaviors are considered sins of the flesh.

As we navigate today's world, it's crucial to remember that we are living in times not unlike those of Sodom and Gomorrah. Modern society often promotes behaviors and lifestyles that directly contradict biblical teachings. It's easy to be swayed by the permissive attitudes around us, but as Christians, we are called to a higher standard. The warnings laid out in scripture serve as a timeless reminder to uphold purity, integrity, and respect for ourselves and others.

Adultery, incest, homosexuality, bestiality, prostitution, rape, lust, fornication, divorce, and pedophilia are clearly outlined as sins. These aren't just relics of a bygone era; they are divine commandments meant to guide us in our daily lives. Ignoring these teachings for the sake of fitting in with modern societal norms can lead us down a path of moral decay.

Let us remain steadfast in our commitment to biblical principles, recognizing that true fulfillment and righteousness come from living in accordance with God's word. By adhering to these teachings, we can protect our families, strengthen our communities, and honor the divine covenant that calls us to live holy and upright lives. Remember, while society may change, God's word remains eternal and unchanging.

 

 

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