Fidelity to your spouse is foundational to righteousness. Immorality is disruptive of marriage, destructive of families, and has no place in a City of Peace.
Group sex, immoral relationships and free intercourse is offensive to God, a violation of the Ten Commandments, and the means of spreading disease. God does not justify carnal relations except between one man and his one wife. They two are the image of God. Anything else degrades and corrupts. Participants in immoral behavior become laden with sin.
Those foolish enough to be misled by this darkness deserve to be taken captive and destroyed, as will certainly come to pass.