Why are Premarital Relations Not Allowed?

How can people be joined together? Well, take two objects for example… How can this microphone be joined to this watch if I don’t hold them both in my hands? Moreso two people. How can they be joined to each other if God doesn’t join them? Just by wanting each other? Wanting isn’t enough…. that’s Humanism: I want you, you want me, but who will join us together?