Willful participation in adultery, fornication, homosexuality, lesbianism, incest, or any other unholy, unnatural, or impure sexual activity.

Let us make our father drink wine, and we will lie with him, Gen. 19: 30-36. Reuben went and lay with Bilhah his father's concubine, Gen. 35: 22 (Gen. 49: 4; 1 Chr. 5: 1). Homosexuality and other sex perversions are an abomination, Lev. 18: 22-23. If a man forces a woman to lie with him, only the man is guilty of sin, Deut. 22: 25-27. Whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart, Matt. 5: 28 (3 Ne. 12: 28). Fornication, uncleanness, inordinate affection are idolatry, Col. 3: 5. In the last days men shall be without natural affection, 2 Tim. 3: 1-3. Sexual sin is an abomination, Alma 39: 3-5.