if men had to have babies the human race would never have reached grandchildren.

On a similar note : if men gave birth to the second child we would have only two children per family ... which may sound cynical at first read but it also says something positive for the empathy of men to their womenfolk.

Now, in case you think I am being serious ...there's the old saying : "If men had babies, childbirth would be a sacrament."
wow