The Bible indirectly forbids Christians shacking before marriage because of temptation & desire. I can understand why many couples (Christian couples included) would shack because living together helps a couple understand each other better. When you're living together, you get a feel for each other's good & bad habits; you find out who leaves the dishes in the sink after dinner, who left the toilet seat up, etc. If living together before marriage prepares a couple for marriage, then it can work, but if not...it's a red flag. Among Jews & Christians, a man & woman living together who planned on marriage was rare, meaning if a couple lived together before marriage, there was no incentive to marry because the couple was already getting marriage benefits. It's still that way today. Many Christians are adopting secular ideologies, so it doesn't surprise me when I hear of Christian couples living together before marriage. Even if fornication doesn't take place between Christian men & women living together, there's always temptation. If you're a Christian, 1 Thessalonians 5:22 instructs Christians to avoid behavior that can be considered evil. When a Christian couple is feeling each other to where touching & smooching happens, it's a matter of time before clothes come off, and...y'all know the rest.
