Sex Before Marriage: Where in the Bible does it say that sex before marriage, is a sin? [Malachi 2, Luke 8:21, Matthew 12:50, Mark 3:35, Exodus 22:16, Deuteronomy 22:13-30]. No Marriage License: Is it possible that some friends who have been together and have kids are married even though they don't have a marriage certificate? They do not profess to be Christians. What do you think I should share w/ them?