I know it's old-fashioned, "regressive", "oppressive" and whatever other pejoratives we care to throw at it, but sex should only be between married men and women. It's the kids who seem to always pay the biggest price, whether through the outright murder of abortion, or broken homes, etc.
Sex, contrary to modern notions is more than about biology or even about children. It entails emotional, psychological and even spiritual bonds that are ignored at our peril. In some ways, ancient pagans, understood this better than us moderns, as sex was often (wrongly) connected in many ways to religion.
But hey, we're more sophisticated, right? Or maybe we substitute priests in robes for guys in lab coats and stone altars for stainless steel