Why would God design an imperfect "reproductive system" for humans in which there is a high probability of an aborted fertilized egg each time unprotected sex occurs?
Forget it. Your continuous ridiculing of God and His design have gotten too tiring. I suppose your contention is that God either doesn't exist, is a bad designer, or is not sovereign. This perverted worldview of yours affects how you interpret things, as demonstrated in this and many of your posts.
Pat yourself on the back. I'm quitting this discussion. You win.
Makes you wonder. Makes me mad.