If we aren't a people who love to do what is right and eschew immorality, we will decay into immorality and receive all the curses that go along with it. STDs, deadly diseases, more abortions, children with no known or caring parents and, in effect, we will be more like the Muslims who do these things in the name of their god to destroy infidels.
They will destroy their own culture in the process, as will we if we become like them. In a world of AIDS and spreading diseases which cannot be controlled by drugs, the sexual promiscuity the world is experiencing right now can only end up as a major plague of one type or another which will be deadly and uncontrollable. Man has consistently been unable to overturn God's laws regarding sex without suffering severe consequences.