#5:
The hu*****and's dick is too small and soft (Think the hammer hit the nail to get into sth---Of course as penis into the virgina, but bend and can't get into). So the screw nail is bigger and harder and get into bit by bit, use your imagination. So the wife needs a screw driver, or a man who can work like a crew driver---use your imagination again!
I was curious if I got the right answer!