Biblical Answer

The Bible defines sexual immorality in several ways. Firstly, it is primarily a reference to literal sexual immorality, which includes acts of sex outside of marriage, such as adultery, fornication, prostitution, and homosexuality. The New Testament terms sexual immorality and sexually immoral assume that sexual activity outside of marriage is illicit sex (Acts 15:20; 1 Corinthians 6:9-10, 18-20). This understanding is also reflected in the Old Testament, where sexual immorality is prohibited for any sexual practice outside marriage between a man and a woman (Leviticus 18:6-20).

In addition to literal sexual immorality, the Bible also uses sexual metaphors to describe idolatry and unfaithfulness to God. For example, in Revelation 14:8, Babylon's sexual immorality is described as the "wine of the passion of her sexual immorality." This metaphor suggests that sexual immorality is a form of spiritual unfaithfulness, where individuals turn away from God and pursue their own desires. This understanding is reinforced in 1 Corinthians 6:9-10, where sexual immorality is listed alongside other sins, including idolatry and greed.

The Bible's prohibition against sexual immorality is not limited to specific acts, but also includes sensual images and behaviors that promote immorality. For example, Exodus 20:14 prohibits adultery, which includes not only physical acts but also sensual images and behaviors that promote adultery. Similarly, Ephesians 5:3 warns against even hinting at immoral sex among holy people. This emphasis on the importance of purity and holiness highlights the Bible's concern with the spiritual implications of sexual immorality, rather than just its physical consequences. Overall, the Bible defines sexual immorality as any act, behavior, or attitude that promotes or facilitates illicit sex, idolatry, or unfaithfulness to God.