The Bible does not use the modern term cohabitation (living together before marriage), but it is explicitly clear on the moral standard of sexual purity and avoiding the appearance of evil (1 Thessalonians 5:22). For Christians, living together before marriage is discouraged because it creates a constant temptation for sexual sin (fornication) and lacks the covenant commitment and security that God designed for marriage. Cohabitation often treats marriage as a trial period rather than a sacred, lifelong covenant, which contradicts the biblical view of commitment.  

Yes, Christians must avoid the hook-up culture. This practice conflicts with the biblical truth that sex is a covenantal act meant only for marriage (Genesis 2:24). Casual sex is considered sexual immorality and is a unique sin against one's own body, which is the temple of the Holy Spirit (1 Corinthians 6:18). The Christian mandate is to pursue holiness and self-control, treating one's body in a way that is holy and honorable (1 Thessalonians 4:4–5; 1 Peter 1:15–16).

Yes, marriage is necessary. For Christians, living together (cohabitation) is not a substitute for the public, lifelong covenant God established (Genesis 2:24). Marriage is necessary because it honors God's design, provides covenantal protection, and is the only context where sexual intimacy is not considered sexual immorality (Hebrews 13:4). The unmarried Christian is commanded to practice purity and self-control (1 Thessalonians 4:3–4).

The Christian teaching is that sexual intimacy is reserved exclusively for the covenant of marriage, where two people become one flesh (Genesis 2:24). Engaging in sex before this commitment is considered sexual immorality (porneia) and is strongly warned against, as it separates the physical act from its foundational covenant, leading to potential spiritual and emotional harm. Believers are called to flee sexual immorality and practice self-control (1 Corinthians 6:18; 1 Thessalonians 4:3–5).