Picoico - where do you live that there is open sexual intercourse everywhere? Are you living near a nude beach or something? Because I can tell you that kind of thing is not the norm around the world...not yet, at least.
PCG, pay attention to the hadith. It said illegal not open. Illegal constitutes intercourse out of wedlock or with someone other than your spouse. If a woman in a muslim society gets pregnant out of wedlock and her crime went undetected until she gives birth, then what do you say?